Smart Battery Charger
This unit was constructed in the shell of a Radio Shack
battery charger. The original unit charged only one type of battery
at a time and only in pairs. This unit allows for mix and
match for AAA, AA, C, and D cells. Each battery is individually
monitored and charged. An LED for each one flashes to show
the current charging condition as follows....
When a battery is first inserted, a small charge is pulsed to it. In between the pulses, the battery is tested for voltage. This prevents the unit from attempting to charge shorted or really dead batteries. If and when a voltage is detected, the unit begins normal charging.