Automatic 3 step charger-maintainer for all 6 & 12 volt lead-acid batteries. Automatic charger for 6V & 12V lead-acid batteries of all types, with std filler caps, or sealed (MF) maintenance free and GEL. Ideal for maintaining batteries of seasonally used or stored vehicles of all types, including classic vehicles and deep-cycle batteries used in stand-by power applications. Simple illuminated LED`s indicate the following : Red LED power on & correct battery connection Charging 3-Step charging program which ensures effective charging of the battery. Totally safe for prolonged connection to the battery, without risk of overcharging. Supplied with 2 detachable & interchangeable battery connectors : - a connector with eyelets for permanent connection - and battery clips for bench charging Amber LED indicates battery is charging ; Green LED illuminates to confirm that the battery is fully charged and the charger has gone into maintenance mode. Easy to use, select 6 or 12 volt by siding selector on rear of charger, connect to battery, then to the power socket. The rest is automatic. The AccuMate mini charges the battery with 0,9A current. The voltage therefore rises gradually as the resistance increases, until a safe limit has been reached. The circuit then switches into a float charge mode with voltage limited at 13,5V (6,7V for 6V batteries) so as to bring the battery gently to full charge & keep it fully charged when not in active use, as recommended by manufacturers of lead-acid batteries, without risk of over-charging. 100 % Safe An auto-resetting thermal fuse switches off the charger’s output circuit if the internal temperature for any reason exceeds a safe limit so as to protect the charger from burn-out. The yellow « charge » LED goes out until the temperature has fallen to a safe level, then the output circuit automatically switches back on and the yellow LED switches back on. Incorrect battery connection If the battery connections are incorrect (wrong polarity), neither the yellow « charge » LED, nor the green « maintain » LED will indicate. This charger has a 2 year warranty.