The EBC100 external battery charger is designed to charge the Uniden SDS100 Digital handheld scanner battery and provides a spare battery. The kit contains a drop in cradle that charges the battery at 1000 mA until voltage reaches 4.1V, then continues charging until charge rate reaches 100 mA. It takes approximaetly 6.5 hours to provide a full charge on completely depleted battery. Kit includes 5.4 AH Lithium Ion battery pack, external charger & AC adapter.