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This page was machine-translated from German. German original version

Care and safety

How to make your battery last longer – and how to recognise when it should no longer be used.

Storing and charging correctly

40–50 %charge during longer breaks[1]
10–25 °Cstore in a dry place, not in direct sunlight, not in the refrigerator[1]
  • During longer breaks, recharge to about 50 % if necessary.[1]
  • Do not run it completely flat – a deep discharge shortens the service life.[1]
  • Heat accelerates ageing: for every 10 °C increase, the rate of ageing roughly doubles.[2]
  • Only charge with a suitable charger; the device manufacturer’s instructions continue to apply.

Recognising warning signs

Lithium batteries are safe when used correctly. These signs mean: do not use it any more, do not open it.[3]

  • Swollen or deformedThe housing bulges, parts no longer fit.
  • Hissing or odourThe battery is venting gas.
  • Liquid or depositson the terminals or the housing.
  • Damaged or unusually hotCracks, dents or significant heating.

What to do?

  1. In the event of smoke, hissing, sparks or flames: keep your distance, leave the room and call the fire brigade on 112.
  2. Remove the battery from the device and do not charge it any more.
  3. Tape over the terminals.
  4. Store it in a safe, non-flammable place.
  5. Please call us instead of sending the battery – do not ship damaged batteries.[3]

Do not open or repair batteries yourself

The German Social Accident Insurance (DGUV) expressly warns: batteries should not be opened, tampered with or modified in any other way. This can destroy the protective devices – resulting in heat generation, ignition or explosion.[4]

When connecting cells, too much heat can also damage the separator and cause an internal short circuit.[4] Cell manufacturers therefore specify spot welding instead of soldering.[5]

Our recommendation: Have a defective battery inspected and fitted with new cells by a specialist workshop that works with suitable equipment and protective measures. How we work

Transport and shipping

Lithium batteries are classed as dangerous goods for shipping. Batteries that are damaged, swollen or have become unusually hot must not be shipped on your own initiative. In addition, batteries and rechargeable batteries do not belong in household waste.

Our service: Shipping and payment · Battery disposal

Sources (5)
  1. Umweltbundesamt (German Environment Agency): Lithium-Batterien und Lithium-Ionen-Akkus (Umwelttipps für den Alltag) [Lithium batteries and lithium-ion rechargeable batteries – everyday environmental tips]. Link
  2. C. Kairies: Batteriealterung [Battery ageing]. Lecture, Paderborn University, 2019. Link
  3. Umweltbundesamt (German Environment Agency): Sachgemäßer Umgang mit Lithium-Batterien und -Akkus [Proper handling of lithium batteries and rechargeable batteries]. Link
  4. Deutsche Gesetzliche Unfallversicherung (DGUV, German Social Accident Insurance): DGUV Information 205-041 “Brandschutz beim Umgang mit Lithium-Ionen-Batterien” [Fire protection when handling lithium-ion batteries], edition February 2024, sections 4.2 (p. 20: heat input during contacting) and 4.3 (p. 23: do not tamper with or “repair” the battery). Link
  5. Panasonic: specification of the NCR18650B lithium-ion cell (“Do not directly solder to the battery”, connection by spot welding) and Sanyo/Panasonic Safety Data Sheet SDS-IBT-00026 (2018). Link

Show us your battery

A photo of the battery and its rating plate and a short description of the fault are enough for an initial assessment.

Send a request +352 2733 8396