"Unique Current Control Circuit maintains power as it prevents electrolyte boil out of 12V maintenance-free batteries during long periods of non-use. LED indicator shows correct connections. Costs pennies to operate. Polarity, short circuit and temperature protected. 5-year Warranty. Works With: 12V maintenance free batteries, Trickle Charge Amps: .25 Trickle Charges at .25A Does not work on Gel or Sealed Batteries"
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