![]() Its smarter than some other maintainer/desulfater units since it is long-term storage friendly - meaning that if the AC power goes out, the unit will shut itself off preventing any current drain on the DC batteries. The big charger will shut itself off as it normally does when the batteries are charged, and this one will automatically pick up and keep it maintained and desulfating. It also allows you to hook up your big charger and this one at the same time after a long ride so you can forget about it. Model 48021 has the desulfator and adds a built-in 2A maintainer keeping the battery pack topped off at the ideal level - yet is small enough to mount on-board if you would like to (you still need an A/C power source). Hook it up once and never touch it again. ![]()
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