WONKEE DONKEE has the following tips to help you care for your rechargeable batteries:
Storage
A hot battery is not a happy one!
When not in use, keep the battery in a place that’s dry and cool. Don’t leave it in direct sunlight or near a radiator as it could explode!
Store your battery in a cool dry place that is free from dust and make sure that the contacts do not touch anything metal or the battery could overheat and cause a fire.
Most come with a protective cover for the battery contacts.
Charging
Don’t run the battery all the way down. Some people, when they know the battery is almost empty, will hold the speed control trigger in until the battery is completely drained and the tool stops running. This is known as ‘deep drainage’ and can actually damage the battery and shorten its overall life.
All batteries need a little bit of life left in them to re-energise when you recharge them. Recharge the battery when the tool starts to slow down.