Things You'll Need
Dead rechargeable NiCad battery
Trickle charger
Digital multimeter or battery tester
Protective eye-wear
Protective gloves
Long-sleeve shirt
As you use nickel-cadmium (NiCad) rechargeable batteries and continuously recharge them, they hold less and less of a full charge over time. Within the rechargeable batteries a dendrite crystal substance, also known as battery charge memory, builds up and decreases the charge capacity. Eventually, when the rechargeable battery no longer holds a charge, the dendrite crystals have built up. To repair NiCad rechargeable batteries, you need to remove the dendrite crystals using an electric current.
Step 1
Locate the black and red clamps on the trickle charger.
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Step 2
Test the NiCad rechargeable battery to make sure it is fully discharged.
Step 3
Locate the positive and negative ends of the NiCad rechargeable battery.
Step 4
Protect your eyes, hands and skin before beginning the rechargeable battery "jump start" process. This is a dangerous and hazardous procedure.
Step 5
Hold the black clamp on the negative end of the battery.
Step 6
Tap the red clamp on the positive end of the battery one or two times. Sparks may crack from the end of the battery.
Step 7
Immediately hold the red and black clamps on the battery for 1 to 3 seconds only.
Step 8
Use the battery tester or multimeter to determine the battery charge.
Step 9
Repeat the process until the battery is fully charged.
Warning
Do not overcharge the battery or it may explode, catch fire or spray acid.
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