Boat battery charging time

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Originally Posted by ApS

A check can be made without meters or bulbs. This check must be made at night, in total darkness.

Hold the removed terminal clamp against the post you just removed it from. If there's a parasitic drain, tiny sparks will jump from the post to the terminal. It must be totally dark, so cover the working area (and your head) with a thick blanket. Keep flammables well away.

LOL, sometimes you can hear the tiny sparks too