Several days ago, Lisa pulled the dead auxiliary battery out of the Big Orange Van and we went over to the local NAPA Auto Parts and traded it in on a new deep-cycle RV battery. Lisa then put it on the battery charger for a couple of days, and on Sunday she swapped it for the "coach" battery in the Rolling Stone. The coach battery is two years old and still holds a charge, just not as well as it did originally. She put it into the Big Orange Van, which doesn't need quite as robust a battery as I do in the RV. I'm now less likely to wake up gasping overnight with a CPAP machine sounding a low-power alarm. Just to be sure all is well, we'll plug the Stone into ground power the day before I next leave. That, along with driving 300 miles to the Bay Area, should assure that everything is topped up.