RoadTrek Boy
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I always was told 10% charge of battery total for lead acid, above this and the plates heat and buckle if on 24/7 high power charge, fast jump start from big garage chargers for a start up only.
Trev, you are quite correct if using an old style charger, BUT with a modern self regulating multi stage charger you can pump a lot of Amps into a flat battery as long as you don't overheat and cause gassing, and as it charges the current drops back to a final trickle then switches off...
Charging at high current also helps to de-sulphate the plates.