The battery is new, as is the whole system. After a great test ride yesterday, I came home and could not get the system to turn on. let me go back. the bike is one of the new lightcarbon gravel ebikes which is a great frameset. Motor M820, battery Bt f100, display DP C030. This was my second ride of about 20 miles. When I dropped the motor to check all connections I found the little yellow xt30 connector was broke where the wire attaches, so just laying there. Might have been broke when I pushed the engine and wiring into the bike during assembly. I attached a new plug and still no go. I tried to charge the battery and only got a green light (full charge) which cannot be correct. Put a volt meter on the yellow plug and it reads 2 volts. I feel confident I screwed something up, I just don't know what. This is my first experience with Bafang as my other 2 ebikes are shimano.