Hugh, that charger would be a good choice, gel or AGM batteries don't like being bulk charged when flat, that charger accomodates that need by trickling when flat before switching to bulk charge, as well as tapering charge as the battery voltage rises.
As a rule of thumb most Gel/AGM batteries will take a charge of C/5 in other words your 85 AH battery should be Ok charged at roughly 15 amps or less.
Last edited by acropolite; 13-09-2013 at 08:34 PM.
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