Hi! I have a 350# "motorcycle weight" teardrop, from a 2-man shop but not a big name. The battery is labeled "universal battery" Non-spillable sealed lead-acid battery UPG UB12350 AGM Type 35 Ah. It is connect to a box labeled "GPC-35-MAX Smart Battery Charger 35amp". The only power draws are a ceiling fan (not Fantastic, but the other brand, as I recall, though it has no name on it) with a ring of LEDs around it for a light, and another light in the tiny "hatch" area. Three toggle switches for these have an LED each. There is an LED charge reading also.
I've had it plugged into house power (in a non-heated but shielded on all sides garage) all along, thinking that the Smart Battery Charger could monitor and maintain the battery. The battery disconnect switch was left connected since I didn't think it charges when disconnected.
The charge reading was 12 or 13 until recently (not that I looked very often, but occasionally). Now the LED light ring has too little power and won't light, and the charge reading is 6.11 (7.5 when I first noticed this).
A -Could house power outages or glitches have affected the charging? All fuses that I can see are fine. (2 30A on the charger box, and a few elsewhere for the individual devices). An ammeter on the battery does go up slightly when house power is plugged in, so I think the charging circuit is intact.
B - Is the battery salvageable or dead, at 6.1V ? I have a "battery tender" coming tomorrow, which has a "force" mode to try to recover a battery. Is it worth it or save my effort and don't bother?
C - if battery is dead, then maybe I'll buy a larger powered one, since I'm reading elsewhere on site here, that 35Ah will only run a fan for one night. I could get a 55Ah or maybe even bigger, though I might have to replace the plastic battery box too.
More side info: Unit was new Oct 2019 and used for 2 nights, but since it was December I didn't run the fan. Just the lights while reading. My usual June trip was cancelled; perhaps using it twice a year is better for it! Battery says 190116 on it, presumably a manufacture date. Anything else I've forgotten to say?