(a) If it has not been 20 minutes since you drove the vehicle or since the engine was stopped, turn the ignition switch to the ON position and turn on the electrical systems (headlight, blower motor, rear defogger, etc.) for 60 seconds. This will remove the surface charge from the battery.
(b) Turn off the ignition switch and the electrical systems.
(c) Measure the battery voltage between the negative (-) and positive (+) terminals of the battery. Standard voltage:
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.