I installed a pair of Noco Genius G3500 chargers this year. The racing rules require spill proof batteries for new replacements, currently I have one flooded and one AGM.
Advantages are: IP65 water rating light weight and easy to mount useful status LEDs automatic desulfation or deeply discharged recovery nice leads supplied with inline fuse http://www.geniuschargers.com/G3500 The 3.5 amp unit was acceptable for me. Other models include 7.2 and 26 amp units. Note that some battery specs include a minimum charging current for best life expectancy. I have noticed that some dual bank chargers appear to have a common internal power supply. So if one bank of batteries become defective and hold the voltage low the other bank does not get charged. At least one charger I worked with went to a bulk charge voltage for a while. That was good for the larger house bank which was discharged, but the smaller starter battery was being overcharged all the time and boiled dry. If you have a larger house battery that does get discharged and a smaller starter battery that is normally near full charge installing two chargers should be considered. Also I got the G3500 new with warranty from eBay for under $40 each .... Michael Brown Windburn C&C 30-1
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