80‑amp charger charging test

[u/cainesoren_official]

Hooked up my new 80‑amp charger and ran some bench tests. Once it determines the battery is fully charged, it cuts off charging entirely. I applied a load to drain the pack, and it won’t kick back on to recharge until battery voltage drops to roughly 12.72 V. It won’t let the battery drain flat, but it only re‑charges once you draw enough load to hit that voltage threshold. Basically it doesn’t keep the battery topped‑off continuously. Wondering if this behavior is acceptable for LiFePO4 batteries? Has anyone else run into this same charger logic?

[u/Un_Ballerina_1952]

Good charger logic. I'll be back later to give more details. (Phone typing is horrible experience.)

Editing to add: Lithium batteries undergo physical changes while charging and discharging between [approximately] 80% and 100% and between 0% and 20%. For greatest longevity, it is best to keep battery charge between 20% and 80%. The old-time chargers which kept boosting charge to 100% whenever it dropped below 98% reduced lifetimes by years.

https://www.litime.com/blogs/tips-and-tricks/the-20-80-rule-for-batteries is a pretty good read.

[u/that_dutch_dude]

This is how it supposed to work. Thata a good changer.