How to store lithium-ion batteries over winter
Correct storing of a li-ion batteries is crucial to ensuring the lifespan of the battery. This is something you need to take into consideration, especially when storing your tools over winter as Lithium-ion batteries are highly susceptible to temperature. Temperatures that are too high or too low can cause the cells to suffer permanent damage.
In rare cases of batteries being stored incorrectly for long periods of time, it is even possible for the battery to become completely unusable, this is called deep discharge.
Deep discharge is when the entire battery capacity is depleted. This usually happens when batteries are stored empty of charge and then discharge themselves even further. If self-discharge occurs for too long, this causes deep discharge. This results in permanent, irreversible damage to the battery.
To avoid this happening and to extend the lifespan of your batteries, please read our storage tips for the winter months below.
Storing Batteries for Winter
So, what steps should you be taking to keeping your lithium-ion batteries working in tip-top condition during winter?
1- Fully charge battery pack
Batteries can slowly lose charge over the months they are in storage (especially when kept in the cold). So starting them off fully charged when packed away will help prevent any damage to the cells.
2- Store it in a dry place
Damp or leaky sheds are not ideal places for storing batteries. As you should not place your batteries where the moisture level is high. The battery will absorb moisture, and this can decrease its lifespan due to water encouraging corrosion. It is better to bring the battery inside to a dry and warm area.
3- Store in an appropriate temperature
We suggest that if the machine is likely to be stored in very cold temperatures, that the battery be removed from the machine prior to storage.
Li-Ion cells will become compromised if stored below 0 degrees. We do not therefore recommend storing in a shed or garage over winter as temperatures in these areas can drop below zero.
Equally, avoid a storage area with direct sunlight as higher temperatures can equally accelerate the battery's ageing. Around 15-20 degrees C (or room temperature) is optimal.
4- If stored in cold check charge status periodically & re-charge
During storage, care must also be taken not to store the battery for too long. Ideally, a period of up to six months should be observed. During long storage, it is best to check the charge status periodically.
5- Ensure storage from metal objects
You should store your Li-Ion battery in a storage spot free from metal objects such as screws & nails that could come in contact with the battery terminals.
