I have a dead battery on my motorcycle. I tried charging it on 12 volts and 2 amps. It charged for about 2 hours, now the needle jumps sporadically up to 2 amps and then rests at 2 amps for about 10 seconds, then jumps again. How do I interpret this? Is my battery fully charged, or is it not taking a charge?
A Voltage meter does not display Amps; Only Voltage. Only an ammeter will show amperage. Most chargers have an Ammeter.
As for the erratic meter movement there may be warped plates in the battery that are touching each other as the battery heats up from the charging. I've always charged my bike batteries at lower currents to keep that from happening. You have to charge it for a longer time but it's much kinder to the battery.
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