The M 820 is currently only available in 36V and 43V versions. My motor is originally a 36V which my salesman flashed for me with the 43v software on request. I only use the 48V battery to get a little more power out of the motor.
Unfortunately, the E69 frame is locked for free sale. Had talked to Mia from Dengfu at the end of last year and had already made an order for a size M frame. The price was also okay, but then I was told there were only a few in stock and they would get back to me. ??? I haven't heard from Dengfu...
The 48V battery is a 13S with 54.6V end-of-charge voltage, which still works with the 43V version of the M820. However, the 14S battery is a 52V and will only work with a 48V version
My bike with the LCES 004 frame is 6 kg heavier and you can already see that in the handling. Downhill, however, I prefer the extra weight. Since I changed the head angle of the LCES 004, the frames are similar in geometry. I don't think there will be a 48V version for the M820 and a 14S3P...