pianotuna wrote:
Remove them to equalize charge the battery. For normal charging leave them in place.
You do have to remove the caps to do your hydrometer spot- checks when equalizing, which also gets you near the acid spatter of popping bubbles. So wear your already-ruined "battery clothes".
For normal recharging or maintenance charging, leave the caps on.
OP--note the advice above re trickle charging vs maintenance charging. BIG DIFF! It sounds like your friend is out of date in his battery knowledge, so keep asking here to get the real scoop.
