Jumpstarts have 12-volt lead acid batteries inside.Generally a 12-13.5 volt DC charger will work. 300mA to 500mA. On the RPAT-777 and RPAT-774 (pictured) the connection is a barrel plug. 5.5 mm outside dia and 2.1 mm center hole. center positive. although a 2.5 mm center hole will work as well.
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Jumpstarts have 12-volt lead acid batteries inside.Generally a 12-13.5 volt DC charger will work. 300mA to 500mA. On the RPAT-777 and RPAT-774 (pictured) the connection is a barrel plug. 5.5 mm outside dia and 2.1 mm center hole. center positive. although a 2.5 mm center hole will work as well.
I have a hb-208b adapter if any one needs one
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