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We have collected the most frequent questions for you so that you can quickly find the right answer to our products.
If you have further questions, please contact us.
Can old and new batteries be mixed in a single device?
No. Never mix old and new batteries in a single device - battery leakage may occur. Replace all batteries in a device at the same time.
Why shouldn't you mix old batteries with new ones?
The performance of a battery-operated product is limited by the weakest of all the batteries in the device. One old or weak battery can cause poor product performance even if all the others are new or fully charged.
Can different battery types be mixed in a single device?
No. Never mix battery types - such as include alkaline, heavy duty and rechargeable - in a single device. Battery leakage may occur.
Can batteries be stored in devices for long periods of time?
No. Batteries should be removed from any device that will be stored for long periods of time.
When should I remove batteries from my device?
Batteries should be removed from devices/equipment when:

  • The device is not expected to be in use for several months
  • The batteries are worn out (to prevent possible damage from battery leakage)
  • The device is being powered by household (AC) current
How does the cold affect batteries?
Batteries can't deliver much power when they are cold. You may find that the flashlight kept in your car in the middle of winter casts a faint beam. Let the batteries warm up to room temperature, and try them again before you decide to replace the batteries.
How does a battery work?
Batteries may seem simple, but the delivery of packaged power is a complicated electrochemical process. Electric current in the form of electrons begins to flow in the external circuit when the device - a light bulb for example - is turned on. At that time, the anode material, zinc, gives up two electrons per atom in a process called oxidation, leaving unstable zinc ions behind.
After the electrons do their work powering the light bulb, they reenter the cell at the cathode, where they combine with the active material, manganese dioxide, in a process called reduction. The combined processes of oxidation and reduction couldn't occur in a power cell without an internal way to carry electrons back to the anode, balancing the external flow of current.
This process is accomplished by the movement of negatively charged hydroxide ions present in the water solution called the electrolyte. Every electron entering the cathode reacts with the manganese dioxide to form MnOO-. Then, MnOO- reacts with water from the electrolyte. In that reaction, the water splits, releasing hydroxide ions into the electrolyte and hydrogen ions that combine with MnOO- to form MnOOH. The internal circuit is completed when the hydroxide ions produced in this reaction at the cathode flow to the anode in the form of ionic current.
There, they combine with unstable zinc ions, which were formed at the anode when the electrons were originally given up to the external circuit. This produces zinc oxide and water. This completes the circuit (which is necessary to have a constant flow of electricity) and powers your torch.
What is inside a battery?
Strictly, the battery is the result of an electrochemical process that converts stored chemical energy into electrical energy. The process takes place between the anode, the cathode and the electrolyte, the three major parts of a battery. The anode is often a metal, the cathode a metallic oxide, and the electrolyte a solution that facilitates the ion flow. Depending of the battery type, the solution could be an alkaline, zinc-air, zinc-carbon or etc. solution for primary cells, NiMH (Nickel Metal Hydrid) or NiCD (Nickel Cadmium) for rechargeable cells.
Who invented the battery?
The Italian physicist Alessandro Volta developed the first electrochemical cell. The term of "battery" according to electronic devices fundamentally appeared with Benjamin Franklin in order to describe the collection of multiple electrochemical cells. In 1792, while working at Bologna University, Luigi Galvani discovered that the muscle of a frog would contract when touched by a metallic object. This phenomenon became known as animal electricity. Prompted by these experiments, Volta initiated a series of experiments using zinc, lead, tin and iron as positive plates (cathode) and copper, silver, gold and graphite as negative plates (anode) and invented the first battery also known as the voltaic pile in 1800.
How do I find the right VARTA alkaline battery?
According to the wide offer, it's always complicated to find the right battery. With the VARTA ranges it is easy to find the right battery for your device.
There are two types of VARTA batteries: primary and rechargeable (NiMH) batteries.
The VARTA Alkaline batteries belong to the primary batteries which couldn't be recharged. Strictly, primary batteries are useful where long periods of storage are required. VARTA alkaline range offers different products with specific functions in order to answer at best all your expectations.

  • VARTA LONGLIFE Max Power batteries deliver precise and flexible energy for digital devices such as digital cameras or blood pressure monitors.
  • VARTA LONGLIFE Power batteries offer the powerful energy needed for devices with high energy consumption such as battery operated toys or flashlights.
  • VARTA LONGLIFE batteries perform especially well in devices with constant and low energy needs, such as remote controls or wall clocks.
  • VARTA ULTRA Lithium batteries are the perfect solution for energy-intensive devices like digital cameras, walkie talkies or smoke detectors and master extremely low temperatures.

Moreover, we are providing clear communication of recommended use by way of pictograms to simplify your choice.

How are batteries being recycled?
If batteries can no longer be used, they should be recycled. Most batteries can be recycled and various materials can be used again. For example alkaline batteries are recycled in the metal industry to recover steel, zinc, ferromanganese, etc. NiCd/NiMH batteries are recycled to recover cadmium and nickel. Li-ion batteries are recycled for cobalt and button cells for mercury. In 2006 the EU adopted the battery regulation, which aims, among other things, to increase the recycling rate of batteries. Approximately 70% of the collected batteries are now recycled on the existing recycling market in Europe. This share will increase in the coming years.
How should I dispose of my alkaline batteries?
Batteries can be disposed in electronics stores, in supermarkets or in shopping centers. Never dispose of batteries in fire, as this could cause an explosion.

Where should batteries be stored?
Batteries have to be stored in a cool, dry location. Avoid temperature extremes that reduce considerably their performance. Keep batteries in original package until you are ready to use them.
Why do we change the names?
We have learned from our qualitative research, that the former names (Longlife, High Energy and Max Tech) were not guiding enough.
The strongest name Longlife had the worst performance compared to the other two strategic battery lines.
There are always two dimensions of that what consumer want to have: Long Lastingness and Power.
The former names High Energy and Max Tech did not show the benefit of durability.
The three new names (LONGLIFE, LONGLIFE Power and LONGLIFE Max Power) communicate both dimensions: Durability and Power in three types.
The research clearly confirmed the better guiding names.

What has changed in regards to performance and why?
Current market trends show the decreasing importance of high drain applications (e.g. digital camera or photo flash) and a growth in low drain devices, like portable audio, remote controls or LED flashlights. To address this trend we changed the internal design of our batteries and combined this with upgrades in raw materials and formulations. Our premium products guarantee highest performance and are also improved in low drain devices.
How many times can I charge my VARTA rechargeable NiMH batteries?
VARTA rechargeable batteries can be recharged hundreds of times! This is why using VARTA's rechargeable batteries can result in significant cost savings compared to alkaline batteries.
How many times can I charge my VARTA RECHARGE ACCU Endless batteries?
The VARTA RECHARGE ACCU Endless batteries are an almost infinite source of energy and can be recharged up to 3500 times (based on AAA 550mAh and AA 1000 mAh).
Are VARTA rechargeable NiMH batteries available in all sizes?
Yes. VARTA rechargeable batteries are available in AA, AAA, C, D & 9V sizes.
Do VARTA rechargeable NiMH batteries have to be fully discharged before recharging?
No. VARTA rechargeable NiMH batteries do not have the typical memory effect. With a suitable charger they can be recharged at any time with no effect on performance or battery life.
Can VARTA rechargeable NiMH batteries be used in any device that runs with alkaline batteries?
Yes, you can use the comparable NiMH battery size in any device that uses alkaline batteries. For example, if you typically use AA alkaline batteries, you can use AA NiMH also.
Do VARTA rechargeable NiMH batteries need to be charged before using them from the pack?
No. The VARTA RECHARGE ACCU Endless, RECHARGE ACCU Power and RECHARGE ACCU Recycled are Ready To Use, which means they can be used straight from the pack.
Do VARTA rechargeable NiMH batteries need to be charged in a VARTA brand charger?
No, all VARTA rechargeable batteries can be charged in any charger. However, VARTA chargers are recommended.
The rechargeable batteries become warm during the charging process. Is that normal?
Depending on the charging current, rechargeable batteries will heat up during the charging process and, above all, at the end of charging. This is normal and is no reason for concern.
However, if rechargeable batteries become extremely hot or the label of the battery starts to release bubbles, this is a sign that they have been overcharged. This could happen with simple chargers which do not have any cut off criteria for the charging process. In this case, you should stop the charging manually and check the charging criteria or charging times and observe the information in the user manual.
What is the difference between the VARTA rechargeable NiMH battery ranges RECHARGE ACCU Endless, RECHARGE ACCU Power and RECHARGE ACCU Recycled?
The VARTA RECHARGE ACCU Endless is our premium range with the highest amount of recharge cycles and very long power in storage.
The VARTA RECHARGE ACCU Recycled is made of 11% recycled material without any compromises on performance. It is available in the most demanded AA and AAA capacities.
And the VARTA RECHARGE ACCU Power is the broadest range with the right capacity for every application.
Does quick-charging damage my rechargeable battery?
No. Charging takes around 15 min - 2 hours with a quick-charger as opposed to more than 10 hours charging time for normal chargers. The relatively high current of the quick-charger requires an especially reliable form of switching off once the battery has been fully charged.

What must be taken into account when charging rechargeable batteries?
Rechargeable batteries can, in general, be charged in any suitable charger. It is important to ensure that the rechargeable batteries are not overcharged in the charger. This means that chargers with higher charging currents must react more accurately at the end of charging. The information in the user manual must always be observed.
What are the different chargers available and how do they differ?
There are three types of charger:

Chargers without cut-off criterion:
These chargers are usually chargers with a very low charging current. The charging time specified in the user manual must be monitored by the user and the charger must be switched off manually. There is largely no risk of overcharging the rechargeable batteries if the charging times are adhered to.

Chargers with integrated timer (time switch):
With these chargers, the charging current is usually slightly higher than in chargers without cut-off. The charging times must still be monitored manually. The timer can only partially be used as a monitoring cut-off (only if the timer time is almost equal to the charging time of the rechargeable battery). Otherwise, the timer acts as an emergency cut-off (please note that the timer is restarted when the charger is disconnected from the mains and then plugged in again). Overcharging of the rechargeable batteries is possible if the charging time is not adhered to. If charging times are only specified very inaccurately or not at all, they can be calculated with a simple formula (see below).

Chargers with extensive electronic cut-off (e.g. Minus delta V, delta Peak, temperature monitoring):
With these chargers, charging is monitored electronically. The charging currents can be very high, with the result that the charging time falls to much less than one hour. The quality of the cut-off criterion plays an important role here. The higher the charging current of the charger, the more accurately the charging process must be terminated at the end of charging in order to prevent overcharging of the rechargeable battery.
How can the general charging time be calculated?
The charging time can be calculated very simply with the following formula:
Charging time (h) = (Rechargeable battery capacity (mAh) xž 1.4)/Charging current (mA)
Rechargeable battery capacity = 2100 mAh (Mignon rechargeable battery)
Charging current of the charger = 380 mA
Charging time = (2100 mAh žx 1.4)/380 mA = approx. 7.7 hours
Do problems occur when charging older rechargeable batteries in the fast charger?
Fast chargers do have very short charging times and therefore use very high charging currents. For safety reasons, it is important that only undamaged rechargeable batteries with a “normal” behaviour during charging are used with these chargers. This is generally taken into consideration and checked in VARTA fast chargers.
How do chargers with a timer cut-off work?
Some simple and thus also cost-effective chargers are only equipped with a timer (electronic time switch) and generally switch off after a set time. This means that the charging times specified in the user manuals for the rechargeable battery types should be roughly adhered to (remove rechargeable battery after specified charging time). The charging times for different rechargeable battery capacities can easily be measured proportionally or calculated. If the charger is disconnected from the mains and then plugged in again, the timer will restart and start charging again from the beginning. For rechargeable batteries with larger capacities, the charging process may have to be started twice.
What must be taken into consideration when charging with the LCD Ultra Fast Charger?
When using chargers with a very high charging current (charging time less than 30 minutes), it is important to take into account that rechargeable batteries will be almost fully charged in the very short charging time specified and that they are therefore ready for use again immediately. To top up the small amount of remaining capacity, the charger should simply be left plugged in for a while (trickle charging).
What is trickle charge?
Trickle charge is low current charging after the main charging process.
The rechargeable batteries become warm during the charging process. Is that normal?
Depending on the charging current, rechargeable batteries will heat up during the charging process and, above all, at the end of charging. This is normal and is no reason for concern. However, if rechargeable batteries become extremely hot or the label of the battery starts to release bubbles, this is a sign that they have been overcharged. This could happen with simple chargers which do not have any cut off criteria for the charging process. In this case, you should stop the charging manually and check the charging criteria or charging times and observe the information in the user manual.
Can alkaline primary batteries be recharged?
No. Primary batteries are not generally designed to be recharged. Charging would cause the risk of leakage as well as the risk to safety to rise very sharply, which is why primary batteries should never be recharged.
Can I also charge NiCd (nickel-cadmium) rechargeable batteries with a charger for NiMH (nickel-metal hydride) rechargeable batteries?
Theoretically yes, but the NiCd rechargeable batteries, which have not been permitted anymore since a long time, had a much smaller capacity than the current standard NiMH rechargeable batteries.
Does rapid charging reduce the life of rechargeable batteries?
While it may be true that rapid charging NiMH batteries can reduce battery life by a small amount, this should be more than offset by the inconvenience of always slow charging batteries. As long as properly designed chargers are used, most NiMH batteries can be recharged in less than 20 minutes without any damage or significant reduction in their life.
Do NiMH batteries need to be completely discharged before charging?
No, if a charger with minus Delta V cut-off or temperature cut-off is used, NiMH rechargeable batteries can be charged without adverse effect at any point regardless of their state of charge.
What charger do I need for low self-discharge batteries?
Low self-discharge batteries (such as rechargeable VARTA READY TO USE batteries) can be charged in any good quality NiMH charger of VARTA.
Can old and new rechargeable batteries be mixed in one charger?
If your charger has single slot charging (charges each battery individually – not in pairs), then yes, older and newer batteries can be charged at the same time. In any other case, pairwise charging will result in an uneven state of charge.
What is the difference between single slot and pairwise charge?
Pairwise charging means that 2 cells are charged in series. To activate the charging process, please note that both cells have to be inserted. Please take care that batteries have the same capacity and the same state of charge in order to avoid overcharging or an incomplete charge. In a single slot charging charger cells are individually recharged.
Which charger enables individual cells to be charged?
Individual cells can be charged with the VARTA LCD Ultra Fast Charger and LCD Smart Charger.
How often should rechargeable NiMH batteries be conditioned?
New rechargeable NiMH batteries do not require conditioning. However, conditioning can be helpful when your older batteries begin to lose performance. It can help to jumpstart rechargeable NiMH batteries that are near the end of their useful life so that you can get as much out of your older batteries as possible. The VARTA Ultra Fast Charger offers this function, for example.
What is temperature control?
The temperature of the rechargeable battery is measured whilst it is charging. If it rises above a defined maximum temperature level, the charger switches off.
What is Minus delta V (-dV)?
It is a method for cutting off the charging process, which takes advantage of the fact that the cell voltage drops slightly (-dV) in a rechargeable battery as soon as the cell is completely charged.
Can VARTA chargers be used worldwide?
The chargers with wide range input (100-240V) can be used worldwide.
Portable Power
Which devices can be charged with a Power Bank?
As a rough guide: Anything that can be charged with a USB cable, can be charged with a Power Bank.
How can a Power Bank be charged?
A Power Bank can be charged using any power source that has a USB output. Charging sources include, but are not limited to, USB Output Wall Adaptors, USB Output Car Adaptors, and even other Power Banks.
How should I store my Power Bank?
Power Banks should be stored in a dry place at a temperature between 0-40°C/104°F (ideally 20°C/68°F). Store Power Banks with a minimum of 40-50% charge of the battery for better battery life.
What type of batteries are used in Power Banks?
Most often Power Banks have a Lithium-Ion (Li-Ion) or Lithium-Polymer (Li-Po) battery.
What is the meaning of the input and output figures in the product description?
Input means the voltage (V) and current strength (A) required to charge the Power Bank. Output means the output voltage (V) and maximum possible current strength (A) available for the device to be charged.
What does "mAh" stand for?
"mAh" means "milli-Amps per hour" and is used to describe the capacity of the internal battery in a Power Bank.
For example: 6000 mAh specifications means battery is rated to supply 6000 milli-Amps for 1 hour.

Why does a Power Bank have an input and an output port?
Input port is for charging the Power Bank. The output port is for charging mobile devices.
What kind of cables are needed to charge a phone/tablet?
It depends on the input connector of the device being charged.
For Example: Micro USB (Samsung & many others), Lightning (Apple exclusive) or a USB Type C connector.

What kind of cables are needed to charge a Power Bank?
Most Power Banks can be charged with a USB Type A to Micro USB cable. Depending on the Power Bank, a USB Type A to USB Type C cable may be used.
How does wireless charging work?
The charger contains a transmitter coil and the mobile phone contains a receiver coil. When the two coils get close enough, power is sent through a magnetic field.
Can I take my Power Bank on the plane?
Certain Power Banks can be taken on board of a flight. They must be stored in the carry-on baggage and may not exceed 100Wh. As there are no clear rules, most Airlines follow the IATA guidelines. If you want to be 100 % sure whether you can bring your Power Bank or not, you should look up the airlines' baggage regulations or ask the airport.
Do the Power Banks have a memory effect?
Power Banks use Lithium-Polymer or Lithium-Ion battery technology, which is not susceptible to any memory issues.
Is it normal that a Power Bank becomes warm during operation?
Yes, normal operation will generate mild to moderate heat. It is suggested to charge/discharge the Power Bank in an open area and stop charging/discharging using it if it becomes exceptionally hot.
What is my warranty for VARTA Power Banks?
2 years starting from purchase date.
What do input and output stand for?
Input describes the voltage and current needed to charge the Power Bank.
Output describes the voltage and the maximum current available to charge a device.
Why is the Power Bank unable to charge my tablet?
If the Power Bank cannot supply sufficient current, charging of a tablet will take an excessively long time to complete. It is recommended to use a Power Bank with minimum 2.1A output to charge tablets.
Does a high capacity Power Bank charge a phone faster than a low capacity Power Bank?
No, charge time is determined by the output current and not the capacity of the Power Bank.
How do I prolong the life of my Power Bank?
To prolong the battery life, please fully charge the Power Bank before usage. Avoid storing Power Banks in extreme heat or cold environments. Always store your Power Bank with 40-50 % charge.
Do not store Power Banks while the battery is completely drained, as this will reduce the capacity of the battery or render it unusable.
Special Batteries
I use batteries from another brand, how can I find a VARTA equivalent?
You can type in your battery type (number engraved on the surface or written on your packaging) into the search function here to find the corresponding VARTA battery.
How can I find the right battery type for my device?
Manufacturers specify which battery type is needed to power the device. Usually the needed battery size is written in the manual of the device or even on the device itself. Most of the coin cells have a designation (battery type) engraved on the surface, e.g. CR 2032 or V 377 (or manufacturer code).
What do when your child has ingested a button / coin cell?
In event of battery ingestion, seek immediate medical attention at a hospital or emergency room. Do not let your child eat or drink until an x-ray can determine if a battery is present. If you still have the battery packaging or the device containing the battery take this with you to help the doctor identify the battery type and chemistry. Visit Button Battery Safety: http://buttonbatterysafety.com/
What is ANSI?
ANSI stands for American National Standard Institute. This Institute provides the world´s leading flashlight standard with precise definitions of terms, marking rules and test methods for measuring relevant perfomance parameters of portable lights and therefore allows to compare performance features more easily.
What does light output mean?
Light Output is the measurement of the total quantity of the emitted overall light energy. The value is reported in lumens (abbreviated "lm" on VARTA packaging).
How is the runtime measured?
Run time (abbreviated "h" on VARTA packaging) is the duration of time from the initial light output value (30 sec after light is turned on with fresh batteries) until the light output drops to 10% of the value.
How is beam range measured?
Beam range is the distance at which the light beam ist still 0,25 lux. Results are reported in meters (abbreviated "m" on VARTA packaging) and measured with a lux meter.
What is the difference between Lumens, Lux and Watt?
Lumen (abbreviated "lm") is a measurement unit, which is stating what total amount of light is emitted from a light source. Roughly can be said that the more Lumens the brighter the light. Lux is the measurement unit which measures the light output in a given area. One lux is equal to one lumen per square meter. Watt is measuring how much energy the product/LED consumes, not how much light output (Lumens) it provides.
What does shock proof mean?
Shock proof is the claim for shock resistance of our flashlights. It measures the degree to which a portable light resists damage when dropped on a solid surface. Drop height for our lights is 1m minimum but many of our lights are tested with a higher drop height (up to 9m, depends on the light type and is stated on the product detail pages). Dropped samples must not exhibit any cracks or breaks and must remain fully functional.
What does IP stands for?
IP stands for Impact Protection (e.g. IPX4). This ratings are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt, etc.) and moisture. This is defined in an international standard.
What is the difference between water proof and water resistant?
Water proof means that the flashlight can be immersed up to the announced depth (IPX7): submersed in 1 meter for 30 minutes. Water resistant means that the flashlight is protected against splashing water (IPX4).
Can I use other batteries than VARTA batteries for the flashlights?
Yes, other batterie brands can be used in VARTA flashlights as well. However, to guarantee the maximum light output, run time and beam range, VARTA batteries are recommended.
What is happening if I insert batteries wrong way up?
If you put the batteries wrong way up into the light devise it can happen that the flashlight is simply not working. But it can also happen, that the light is going on and after a short time is going out or is shining less bright. In that case please check if the batteries are inserted correctly.
Are VARTA lights safe and secure products?
Yes, all VARTA lights are CE certified and therefore tested against all necessary European standards. We are working together with international institutes such as TÜV, Intertek and SGS to test our products against European standards. However, also the safest product is not protected against misuse.
Which are the advantages of LEDs?
LEDs have many advantages compared to incandescent bulbs. They have an extremely long lifetime and are virtually unbreakable. In addition, they are highly energy-efficient providing higher light output with lower electrical energy. Finally, LEDs provide clear white light.
Does an LED needs to be replaced/burns out like a bulb?
LEDs don’t need replacement since high performance LEDs last for approx. 50.000 hours, 5mm LEDs even for approx. 100.000 hours.
What LEDs are used in VARTA lights?
VARTA is using different LEDs depending on the type of the light. We are differentiating between standard 5mm LEDs, which are virtually shatterproof and highly resistant to imacts, and High Performance LEDs, which have the same advantages then standard LEDs but, due to improved materials and an increased chip size, a higher light output (for example Cree LEDs or Samsung LEDs).
What is a COB LED?
COB stands for "Chip on Board". For COB LEDs, multi LED chips are packaged together as one lighting module. When it lights up, it looks like a lighting panel. Advantage is a very high light output in the tightest of spaces.
Does the 3 years VARTA guarantee for flashlights include batteries and LEDs?
Batteries are leak proof according to the expiration date printed on the battery label (e.g. at alkaline batteries normally 10 years) so they are not included in the 3 years guarantee but have an even longer guarantee. High performance LEDs last for approx. 50.000 hours, 5mm LEDs even for approx. 100.000 hours. That means they don’t need to be changed during the life cycle of the flashlight.
Do VARTA Lights have low battery indicators and if so, how do they work?
Some of our premium lights do have a low battery indicator. This can be a blue or red LED within the light body which is blinking once the battery is getting low (e.g. our rechargeable Night Cutter flashlights) or the main LED is flashing several times once the battery status is getting low (e.g. our High Optics flashlights).
What is the advantage of frosted lenses at area lights?
Frosted lenses are used especially on area lights and lanterns and are providing an ideal diffusion of light. Also, due to the frosted lense, the light is not glaring.
Can Rechargeble Accus be used for flashlights?
Flashlights can only be driven with batteries which run on the packaging named voltage (e.g. 1,2 -1,5V), so we recommend to always check the information provided on the packaging. Especially Li-Ion rechargeable accus have a higher voltage and can therefore be not suitable for usage in flashlights.
What does the FSC logo stand for?
The FSC logo indicates that the paper material which is used in the packaging comes from sustainable managed and monitored forests.


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