Charging Procedure : First output power charger wire ends are connected to the battery anode and cathode , the charge indicator turns green, the connection is correct, otherwise the charge in question, please check the actual situation. Then city power plug to socket , the indicator is red, charger will be into the charging state . When the indicator light turns to green, the battery is charged to 95% , If you want to reach 100% , keep charging for 1 to 2 hours before end of charge. When fully charged, disconnect the city power first, then disconnect the battery cable.