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Its somewhere in between, but closer to gas vs diesel. The BMS systems on the cars are very particular about how they manage the batteries to ensure maximum life and performance. If you change out to another chemistry, the BMS has no idea what is going on and will most definitely freak out unless the new chemistry acts virtually the same as the old which is highly unlikely. However, it is possible because the BMS is just looking for specific signals, and if you can fake those signals you can do whatever you want. Its just a lot of work to do all that. Guys have done it though. There are 1st gen Insights with lithium ion packs in place of the NiMh OEM pack. The BMS must be spoofed to do this, but it does work quite well once its all in place from what I've read.
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