I've used the Pro-Fill system on three boats now. On all of them at least some of the fill caps were hard to get to so the system made it a lot easier. A few squeezes on the bulb and they're all full to the correct level.
And as said earlier, only fill after charging. I once had a job tending forklift batteries in a large warehouse and our procedure was to top off just before putting the battery back in the truck after charging. Get it wrong and they'd puke all over the floor. Hell of a mess with those huge batteries.
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