Bematech DC-3500 User Manual page 61

Left LED
Left LED - The LED lit when a battery is inserted into the rear battery slot of the
Right LED - The LED lit when the cradle is connected to AC power.
Charging the Battery separately in the cradle
Insert the battery into the compartment at the rear of the cradle.
Connect the power jack to the cradle and plug AC adapter into the socket.
cradle for recharge. It remains lit until the charge is complete.
Right LED