“Hi Joe, I suggest a load test on the battery that’s not holding a charge. Also I’ll ask you to see if there’s anything that is wired to the side of the battery switch that is always hot. Memory wires for radios or other pieces of electronics that are always powered up might be the culprit. Original batteries on the 348 Walkarounds have always been Group 31 AGM (absorbed glass mat). There are various suppliers for these. We now use the ones made by East Penn Deka. Let me know if this information answers your questions. Regards, Joe Brenna”