[Isaac Zachary]

Originally Posted by S Keith

It's not a rumor. I'm in weekly contact with my dealership. I collaborate with other builder in other regions, and they report the same.



Sounds like you're buying the hype. They are actually intolerant of > 3.65V. This increases the stress on cells. The reduction in charge voltage from 4.20V to 3.65V is a primary reason LFP has longer cycle life. Initial LFP specs identified the operating range from 2.0V to 4.2V. After a few years in the field, it was discovered that this was preventing them from reaching quoted cycle life and was reduced to 2.5V to 3.65V losing only about 5% of the total capacity.

There's no balancing between the modules, so while the 5S in a single module may stay reasonably well balanced, there's nothing preventing drift between modules.

I'm guessing you haven't spent dozens of hours working with Techstream. I've seen > 20V/block in techstream, particularly in cooler weather and regularly over 18.25V in all conditions.

NiMh SoC is both voltage, current and temperature dependent, i.e., it changes with temperature. LFP does not. When colder, the car will push the LFP to higher voltages than it will when hot.



More hype. Gen4 NiMH modules (which are in all Gen2 packs) are rated for > 20C or 130A. Typical large cell EV rated LFP is 0.5C charge and 1C discharge. Yes, they can be designed for higher C rates, but the compromise is cycle life.

This was a sloppy and cheap implementation. The successful Lithium conversions go the extra steps to create a spoofing system to feed the battery computer the data it needs to have the car treat the LFP like it should needs to be.

I have extensive personal experience with NiMH and Lithium. I personally have >10kWh of LFP and 55kWh of Li-NMC and have done a lot of cell level testing. I've built an off-grid power system using the aforementioned Li-NMC for our eventual retirement home. I don't know everything, but I know what sound design approaches look like as well as bad ones.

Good to know! Thanks!

I stand corrected!

P.S. I tried to cheat at getting Tech Stream, but never got it to work. I also didn't see the point in renting it for so much money every year. I miss the days when all you needed was a voltmeter and vacuum gauge.