The lead acid (alarm type) batteries used will drain down below the capacity of the float charger to recharge them. Remove the battery
pack; (remove screws, remove far left had side digit). Charge it for about 1/2 an hour with a light weight car or motorcycle charger. Put a
volt meter on the battery an see if it gets close to or over 12 volts. If it does, replace the battery and the float charger will work just fine. You can leave it plugged in for extended periods. It is made for that. The battery box will accomodate several sizes of 12v batteries. You can source the 6 v batteries we use in series at any decent electronic
store. They are Power Sonic PS-632 (3.2 amp hour, 6 volts)
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