LFP battery EV - charge to 100% - how often ?
For someone who uses the EV for city driving - very less miles accumulated (50 miles a week) - it's more important to protect the LFP battery pack from calendar aging than cycle count aging. One would love to keep the battery at around 70% soc, use it to about 40% soc and charge again to hit 70% Soc.
But LFP having a very flat voltage curve, the BMS can't keep the exact soc. More importantly keep the exact soc of each cell. Soc of the whole pack hardly matters since the commute is very short and don't really need the range. The concern is only about cell balancing.
The bigger question is - how often does the individual cells of the lfp pack lose balancing beyond an acceptable limit. For example, for every 300% depth of discharge, the cells lose balancing of about 20% critically needing rebalacing by charging to 100%. ???