Purchased two GC-2 Interstates back in Sept. of 2013. For a couple months now, my charger (not the onboard converter/charger) has been telling me "bad battery", cannot charge. Thinking the charger is ...
Open circuit full charge voltage 6 volt = 6.37 12 volt = 12.73 At 13.6 it should bring them to full charge. That would lead me to suspect uneven spg in one or more cells, or possibly sulfating.
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