Kellie, different gas stations have different limits set up with their cc providers - or set up FOR them with the providers. That said, when it stops, I just put the card in and fill again. Have been stopped at $50, $75, and $100. When stopped at $100, I knew I was close to full, but wanted it full - got another $3.25
Sorry about the winterizing problems. I just replaced my battery - first time I didn't drive the rig in to do it (AutoZone) - then they take it out and put the new in. I suggest you take a picture of the battery connected. Keep it in the battery storage area - you'll always have it then. This time I took the battery out myself, and put the new one in myself. If they only weren't so dang heavy!
NOTE: if your battery is low, start your engine - it charges your auxiliary battery - you could then run the pump. Only would have needed the engine running for that few seconds/minutes. I sometimes need to start the engine when my generator is acting up - as it drains too much of the battery getting it started when it does that (when it's real cold, for example)>
Be grateful you have a friend willing to help!