Anyone have experience over-discharging a Shorai battery? I just read on their website that you should not allow the no-load voltage to go below 12.8V. My battery reading, read from within TuneECU, under some load (headlights, ECU) was 12.1V. I didn't have a handheld volt meter handy, so I couldn't get a reading of the no-load voltage. What is a typical battery voltage under the load of the headlights and ECU? How long do these Shorai's typically take to charge (say from 50% charge)?