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The problem with Li batteries is that they are multiple cells.
Some cells may be in a better state than others.
When a cell gets to a too low voltage, previously, the other cells would try to 'negatively' charge this cell; resulting in the cell exploding or leaking or expanding and breaking.
Nowadays there are BMS controllers, (Battery monitoring systems), that will cut off bad cells, before they cause any damage.
If for instance, 4 of 5 cells show 80% charge, and one shows 40% charge, and you keep on using the battery, without charging it, the bad cell may go downto a point of no return, where either the BMS will disable it, or it'll take forever to rebuild that cell to pump back some energy in it.
A broken cell will never attain the same charge levels as before, even after charging it for a long time.
Most of these issues happen when batteries are completely depleted.
It's better to have an inaccurate battery meter, and charge your battery to full, than have an accurate meter, and destroy the lifetime of the cells.
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