Why Proper Storage Is Crucial
Lithium-ion batteries are technically high-performing, but they are sensitive to external influences such as temperature, charge level, and environment. Unsuitable storage can cause the chemical processes inside to accelerate, making the battery age faster. Extreme temperatures, permanent full charge, or complete discharge over a prolonged period are particularly critical.
If you store your batteries under suitable conditions, however, they remain stable, high-performing, and safe. This is especially important if you own multiple batteries or do not use them for extended periods.
How to Store Lithium-Ion Batteries Correctly
For optimal storage, you should pay attention to a combination of temperature, environment, and protection. Batteries are happiest at moderate temperatures — ideally around 10 to 20 degrees Celsius. Excessively high temperatures, such as in a car during summer, can permanently damage the cell structure. You should also avoid direct sunlight.
A dry environment is equally important. Moisture can cause corrosion over time and damage contacts. Store your batteries in a protected location, and not in damp basements or unheated rooms with high humidity.
Another key point is protection against short circuits. Batteries should never be stored loosely together with metal objects such as keys or tools. Dedicated storage boxes or separate compartments are a good idea. You can find suitable products in our Batteries and Chargers ranges. Our batteries are also generally supplied with an appropriate plastic case.
Storing Batteries: The Right Charge Level
A common mistake is storing batteries at the wrong charge level. Lithium-ion batteries should be stored neither fully charged nor completely discharged. The ideal range is around 40 to 60 percent.
A permanently high charge level increases what is known as cell stress, which accelerates ageing. A completely discharged battery, on the other hand, can fall into a deep discharge and be permanently damaged. A mid-range charge level ensures a stable chemical balance and is therefore the best choice for longer-term storage.
Storing Safely and Avoiding Risks
In addition to the right environment, safe storage also plays an important role. Batteries should always be stored in a way that provides mechanical protection and prevents damage. Avoid pressure, impacts, or loose storage in bags and boxes.
Caution is also important with regard to fire safety. Do not store batteries near flammable materials and make sure they are not exposed to extreme conditions unattended. Mindful handling is especially important in workshops, vehicles, or when camping.
Implementing Long-Term Storage Correctly
If you are not going to use your batteries for an extended period, you should prepare them deliberately. Charge them to around 50 percent, store them in a cool and dry place, and check on them at regular intervals. This ensures they do not fall into a deep discharge and remain ready for use at any time.
These recommendations apply to all common cell types, including 18350 batteries, 18650 batteries, 20700 batteries and 21700 batteries. Regardless of format, all lithium-ion batteries benefit from careful storage.