this post was submitted on 25 Dec 2023
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Lower is no problem. The damage is done by the high voltages and also temperature. Don't go below something like 2 V and you will be just fine.
Whilst going below 20% is definitely a lot less bad than going over 80%, it will have the longest life if you stick between those two.
No. Going as low as possible and staying as low as possible is the best for any lithium battery. Here a good source: Accubattery. Note how "battery University" is not a credible source, despite their name. Maybe they made people believe this in the first place.
And here a primary source for the most fragile LiPo cells. Look at figure 7. Even down to 1.2 V and the cells still reached 50 cycles until they were at 80 % remaining capacity. Not going below 2 V and it will be just fine.