FEATURES " Temperature protection electronics optimises the charger rate in extreme temperatures to extend battery life " Encapsulated circuit board protects the electronics from dust, moisture and impact " Progressive charge indication: battery LED's light up incrementally to give feedback on current charge level of battery pack " REDLITHIUM-ION™ 3.0 Ah / 4.0 Ah battery packs recharge in 60 min / 80 min or less " REDLITHIUM-ION™ 1.5 Ah / 2.0 Ah battery packs recharge in 30 min / 40 min or less