Maybe this work for you to
I recived yesterday my extra battery, when i put it it gives to me error 50. I removed the battery, turned on the scooter, sync whith my android phone an then i conect my extra battery to the scooter. On my phone was displayed a mesage that i have bms upgrade i pick ok. The bms was upgrated (from 1.3.0.3 to 0.6 if i remembered it correctly) and all works fine whith 2 batteries. I think the error es 50 hapens when the 2 bms dont has the same firmware.
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