Eric Salop
Elite Member
Don, if you are measuring 13.4 V, is that with or without the charger connected ?
While you are charging, the only way to be sure how full it is is to measure current. If you disconnected the charger and read 13.4 V, then that's going to be pretty close - leave it a while to settle, then measure again. A fully charged battery will read about 12.6V
The 12.2 V you got before charging was a good sign that the battery hadn't fully discharged, so is likely to be in good condition.
While you are charging, the only way to be sure how full it is is to measure current. If you disconnected the charger and read 13.4 V, then that's going to be pretty close - leave it a while to settle, then measure again. A fully charged battery will read about 12.6V
The 12.2 V you got before charging was a good sign that the battery hadn't fully discharged, so is likely to be in good condition.