Quote:
Originally Posted by Isaac Zachary
These guys seem to have figured out how to make LiFePO4 work in Toyota hybrids. Basically every block of 12 NiMH cells are replaced by 5 LiFePO4 cells. The max and min voltages seem to coincide nicely. The only problem I see with this setup is cold weather as freezing temps can kill a LiFeO4 battery. But they do put a BMS in each block of 5 cells. I guess if you can follow their design than you could make a DIY LiFePO4 battery that would work.
https://projectlithium.com/
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I'd probably be willing to pay 10x more for their engineered solution. My experience with replacing NiMh batteries with lithium has been extremely good. Roombas used to come with NiMh that wouldn't last even 1 year. I replaced the pack with a lithium one that someone on a forum had engineered, and the battery is still working to this day, more than a decade later.
That link also has a 12v battery replacement for only $170, which is quite cheap.