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Probably there are 80 cells in one pack and 88 cells in the other, and you didnt move the BMS from under the back seat so the car can't talk to the new pack. 2.51v is the default when no data is received. The BMS wont have been wiped, etc, thats a rumour but hasnt even been shown to actually happen. I've bought cars that have been sat for years, fixed the faults and they fired up. Even if BMS data was forgotten, its just capacity stuff that it can relearn.You really need a better diagnostic tool so you can have a description for the fault codes. See my comparison of diagnostic tools here.[MEDIA=youtube]CIBlucH9xFA[/MEDIA]
Probably there are 80 cells in one pack and 88 cells in the other, and you didnt move the BMS from under the back seat so the car can't talk to the new pack. 2.51v is the default when no data is received. The BMS wont have been wiped, etc, thats a rumour but hasnt even been shown to actually happen. I've bought cars that have been sat for years, fixed the faults and they fired up. Even if BMS data was forgotten, its just capacity stuff that it can relearn.
You really need a better diagnostic tool so you can have a description for the fault codes. See my comparison of diagnostic tools here.
[MEDIA=youtube]CIBlucH9xFA[/MEDIA]