It takes about 3 1/2 hours to complete recharge battery. Blue LED light is blinking when battery is recharging and steady when fully recharged.
It is normal for the battery to get warm while charging. When the battery is charged, AC charger will provide a trickle current just high enough to maintain the battery charge. While charging, if AC charger is very hot or notice any abnormal condition, unplug AC charger and contact Customer Support.