My personal favorite (after 20+ years of boats and "toy" cars) is the Guest Battery Pal maintenance charger (float for maintaining only) or their 6A ChargePro charger (three-stage 6A charger with float stage). Both have the key provision of a float stage that won't overcharge, which is the key point; any electronically controlled unit with this ability should be ok. The auto-off units that theoretically shut off at a certain voltage have cooked batteries for me in the past.

__________________
Craig Bethune

'97 SL500, 40th anniversary edition

'04 Olds Bravada (SWMBO's)
'06 Lexus ES330
'89 560SL (sold)


SL--Anything else is just a Mercedes.
(Kudos to whoever said it first)