Quote:
Originally Posted by Bc2005
Apparently some of the newer chargers also have a voltage sensor that prevents charging the battery if it’s below a certain voltage when the charger is connected. AFAIK, the logic is that if the voltage is really low (say 6 volts) there may be a dead cell or physical damage, so it need more than a simple charge. However, I assume there is also probably a way to bypass that “feature”.
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Try connecting any 12v batt in parallel for a few seconds...just enough for charger to sense voltage and start charging. We normally use some small batterytool aku for this