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A 120Ah battery is one hellova battery!!!!!!!
We manufacture binlifters and only use 50 or 85Ah Gel batteries for continuous use!!
The recommendations are to charge at 10% of the capacity ( ie 5 or 8.5Amp ) with a three stage electronic charger, our charger units I think costs about $280.
For smaller batteries (20Ah) I use a small electronic charger which is rated for 1.5A and only cost $75. Works a treat for all my home telescope batteries.
I screwed up a couple of big Dry cell/ Gel cell batteries using a 2A "KMart" special before investing in the 3 stage unit.
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