Rejuvenating old lithium-ion batteries

[wraper]

Laptops are often no less than 0.3C; phones are sometimes 0.6C or 1C if you include fast charging. It took me a while to understand what C referred to, so I don't think everyone is innately familiar with it the way they would be with V/A/W.

With EVs it becomes a bigger problem during charging. I had a Leaf which degraded from 70% to 55%, and the battery would get incredibly hot from just a couple of short fast charging sessions; the BMS was not engineered with the end-of-life stage in mind.

Xiaomi 12C which i recently purchased for my wife has 4.5Ah battery, 67W charger and full charge from zero in 39 minutes. It has Quick Charge 4, which should get 50% from zero in 15 minutes according to UL, so this suggests at least 2C. But Xiaomi 12 Pro is even more insane, 4.6Ah battery, 120W charger and it gets full in 18 minutes.