[cstreit]

12V chargers don't do well with multiple batteries. Probably they way they calculate the float voltage, might be an average or something. I converter my RV to 12 volt parallel batteries when my 6 volt series one exploded on the side of hte highway (long day). However one battery started failing before the other. ...the 12V charger tried to "keep up" and destroyed the second by overcharging it.