Should i charge to 100%?

[MoDolph]

It would be nice if someone would do a similar video focussing on the LFP battery.

It's not a video but the attached paper has a lot of the answers that you want. Start at section 7.1 unless you are into modelling.

The colourmaps are really useful once you get your head around them.

This table summarises the results quite well:

It shows that the only thing that stresses LFP is the discharge rate. This is why the xpower uses NMC. The SR only has 125kW power output, which is 2.5C so that is not really a concern.

If the model is correct then you can charge an LFP battery whenever you like to whatever charge you want and it will not affect the life much. This is likely because the LFP electrode materials do not crack when cycled and the fully charged voltage is lower.

However, the paper does also show that NMC can have significantly better life than LFP by keeping the DOD low. They also have a table showing lifetime under different scenarios:

It's all academic though since the cycles are so high.

 

[Rolfe]

Thank you!

Perhaps the take-home message is that the NMC can significantly repay careful management, but mainly you can ignore being careful with the LFP and it won't make much difference.