Unlike old nickel-cadmium batteries, the modern Lithium-ion batteries do not self discharge, and therefore can be used straight from the shelf, with a battery percentage of 30%. This new electronic system automatically puts the batteries into an idle state when they have not been used for a long time. This protects against harmful discharge.
Stihl batteries meet the highest safety standards and have a built in management system, meaning they will not overheat. Once a battery is fully charged, the charging process is automatically ended and the circuit is interrupted, preventing overheating.
While the Stihl batteries have a high safety standard, to keep them safe, you should avoid exposing them to extreme temperatures. Make sure to keep them away from children and remove the batteries from machines after use.