On saturday I ran a real world max range test. With fully charged batteries (pack was at 76V) a second rider and the lights on I wanted to do 40 miles (37 is the most I will need from a full charge.) The bike was fine and the low voltage light didnt even blink under full acceleration. (This is the 21 60AH lfp model.) Voltage on the pack was 69V. I decided to keep going until the light blinked under full accel. About 7 miles more and the light started blinking. So I went home (about 1/2 a mile.) I checked the voltage again and it was at 67.8V. My question then is. No light on accel = 69 V / 21 average (i know thats not the best way but I dont have test leads on the batts yet) = 3.28; light on under full accel = 67.8 v /21 = 3.22V.
Nominal voltage on lifepo is 3.2. So, since both of these readings are above 3.2 did I still have significant stored energy to continue and should I worry about the light under full acceleration? I want to get a feel for range and when to quit with about 30% life left (to keep it out of the danger zone for lower cells and to have 3000 cycles if needed.) Once I get my test leads on I will be able to tell how balanced the cells are. I can say the top 6 are all within .1V of each other but I cant easily get to the bottom 15. Oh and anyone not using their thundersky charger and want to sell it?