Well Andy makes a point. Heat is what kills you and 2 amps on a couple of hours is 4 amp hours. So what if the circuitry allows the current to double due to the half voltage charging resistance. Ok so it's 8 amp hours, big deal. Obviously the size of the battery matters. For a size 24 or larger I wouldn't give it a second thought.
Lest we remember that a given engine requires so many hp to spin it up. Back in the day, the HP (746 watts....dc volt-amps/HP) was produced by 6 volt batteries using twice the current of today's 12v batteries. So what if the current doubles from the 2A setting on the charger.
I have a couple of size 27 6 volt batteries out back. I'd have to partial charge them before I did the test. I think I still have a 2/10 amp 12v charger on the shelf. Might take that on tomorrow and check the charging current between one and 2 across 12 v.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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