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My answer at least to your question of "How Long' to leave a battery charger on is IT DEPENDS. 1) If its a cheap older (dumb) very low charge rate charger, it may well take several hours to bring an otherwise good but discharged battery up to charge and theres a lesser chance of accidental overcharge if its only a low amp charger. 2) If its a late model "smart charger" the time required to charge still depends on its size n charge rate HOWEVER theres less chance of accidental overcharge since they better automatically decrease charge rate once the battery is charged up (maintenace float) 3) If its a big honkin older style high amp capacity charger/booster and youre on the higher charge rate, she can charge fast buttttt tt I wouldnt leave it on indefinitely cuz it can more likely acidentally overcharge and/or outgas n boil over the battery. If the vent caps are off and shes in a safe place where the gasses cant accumulate and all the cells are bubbling n acting the same with no gray or milky color and you monitor her (all 3 cells) using a battery hydrometer like Hal or Jim posted youre doin most of the RIGHT N SAFE things. As posted its still + to + and - to - from charger to battery regardless which battery post is tied to a huge hunk of tractor iron (i.e. Pos or Neg ground) and its best to make say the frame/ground connection (if battery still in tracotr and grounded) last and like somewhere on the tractors iron frame away from the battery so the sparks created arent near the battery and its source of explosive gasses. Keep safe n yall take care now John T
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