I've got an automatic door that runs off a 12 volt battery that we installed in late spring. We've had a run of days with highs in the low 30's and the battery barely has enough (even after a recharge) to open the door in the cold. Has anyone else with an automatic door experienced this problem? And if so, what did you do? I don't want to give up the convenience of my door but hauling the battery in and out nearly daily to recharge erases the settings and makes the whole thing almost more trouble than it's worth. Any suggestions?