Dead Nickel Cadmium batteries (Nicad) can be fixed after they no longer hold a charge. The capability of a Nicad rechargeable Dewalt power tool battery to hold a charge decreases during everyday use. Once the battery is charged, used and recharged, a layer of dendrite crystals begins to form within the Nicad rechargeable battery. To fix a Nickel Cadmium battery, the dendrite crystal layer needs to be removed using an electric current.
Test each dead nickel cadmium rechargeable battery to be sure that it has been completed discharged.
Hook the black alligator clamp on the trickle charger to the negative end of the nickel cadmium rechargeable battery. The negative end of a battery is usually flat.
Flash the nickel cadmium battery to fix it by tapping the red alligator clamp on the positive end of the battery 1 to 3 times. Spark may emit from the Bosch power tool battery during this process.
Continue "jumping" the dead nickel cadmium rechargeable battery by holding the black and red alligator clamps onto the battery for a maximum of three seconds.
Check the charge on the nickel cadmium battery using the battery tester. If the battery is not fully charged, repeat the recharging process.
Wear protective gloves, goggles and clothing during the nickel cadmium recharging process to protect yourself from injury during this potentially hazardous process.
Mishandling the nickel cadmium battery could lead to an explosion or fire. There is also the potential for battery acid to leak or spray from the Makita power tool batteries.
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