With the EBC100 external battery charger you can easily charge a spare battery for the Uniden SDS100 Scanner so you'll be able to keep scanning without down time. This kit includes a battery, the charging dock, and an AC wall charger. Battery clicks in place in the charger and a red LED light lets you know it's charging. When it's fully charged the light turns green to let you know it's ready to go. Charge time is approx 6.5 hours for a fully depleted extended battery.