The battery can be charged irrespective of its charge level. An automatic check establishes conditions on which the charging process depends. In normal conditions, for example, the high-speed charging process is started directly. In other conditions, e.g. extreme cold or exhaustive discharge, gentle charging is performed at reduced current strength. This charging method protects the battery and is essential for ensuring a long service life. The intelligent charge control system controls each battery cell individually, ensuring that each cell is fully charged. This produces maximum supply of power. Overcharging is not possible, so even a charged battery can remain in the charger. The battery has a 3-stage LED indicator which indicates not only the battery charge, but also extreme temperature conditions. It also has a triple shell design for optimum protection against damage.