I am admittedly a novice when it comes to electronics. So please help me understand better some basic things. I have been trying my best to follow some of the battery / R/R / stator discussions here and so a while back I thought a good start for me would be to at least add a voltmeter. I installed the Battery bug which not only displays volts but also % battery life. I was running a Shorai that initially failed and I was sent the larger upgrade (model LFX21A6-BS12). Recently after a 2 week hiatus off the backup charger with no riding, the voltage had dropped into the low 11 range and the battery was listed at 2% charge. When I plugged in back into the charger, it would not take a charge or increase the voltage at all. Frustrated that another lithium battery had failed on me, I pulled it and put the OEM battery back in, but this one had also been sitting for a while so I went to my local BMW dealer and bought the only non lithium replacement they had in stock: a Bikemaster "tru-gel" battery model MG14-BS. I took this home and slapped it in the bike and plugged the voltmeter back on and it registered only 8% charge. The bike started and I took it out and rode about an hour but still only at 8%. So I pulled the battery and plugged it into a battery tender / charger overnight then re-installed it this morning. The voltmeter now reads 12.6-12.9 volts while parked, engine off, and then 13.6-14.1 volts when running at idle. In both instances it registers as 21% of battery charge. My question is this. Is the percent charge inaccurate? I was under this impression that mid 12 volts was OK. I am trying to get my head around this and have been following the R/R discussion trying to decide if changing to a MOSFET or series R/R will prolong my battery life or am I totally misinterpreting the voltmeter in the first place?