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how does the leaf BMS recognize a bespoke battery pack?
By default the Leaf BMS will only work with Leaf modules. If you change the chemistry (i.e. use a Volt pack) it's very unlikely the BMS will work.

Obviously you could reprogram the Leaf BMS firmware (as Wolf has done) but I think that is beyond most peoples knowledge and budget. Possibly an alternative path would be to commission Wolf to provide a CAN emulator that makes the Volt Battery 'look like' a Leaf Battery. I think the Volt BMS must have been hacked by now.

What do I need to do to get it to communicate?
Reverse Enginnering the Nissan Leaf BMS Serial Protocol...
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