The set allows users to build a custom 12V Max combo kit or expand a current system. The BAT414 battery is a light, and it delivers up to 50% more runtime than the 12V Max 1.3 Ah battery.The Bosch GAL12V-20 Lithium-ion 12V Max charger gets the user power ready in a hurry. The charger can fully charge a spent BAT414 battery in approximately one hour.