Consumer type lithium batteries that are fully discharged to 0% SOC (State Of Charge) is NOT the same thing as discharging to the battery's zero voltage point, which would ruin the cells.
The internal BMS in the lithium batteries used in things like laptops, cordless power tools, and cellphones are (or should be) protecting the cells from damage, and the BMS will normally begin what is called 'bottom balancing'. Then during recharge they are brought to 100% and the BMS will begin 'top balancing'.
This is how all the cells in the battery are brought into 'balance'. The first few 100% charges performed may generate a very modest amount of warmth felt in the pack or device as the balancing is occurring. This is normal.
Most newer lithium batteries include a note about this procedure, generally the same across types and brands, although there will be slight differences.
I have two laptops, 3 drones, and several tablets and smartphones that all self-discharge to 0% (or nearly 0%) if left unused and uncharged for a longer period of time. This is intentional: there is a circuit that does this automatically and then 'parks' or 'puts the battery in sleep mode' at 0% SOC for safe storage. It doesnt damage the batteries at all, and at some later date they can be put back in service with a full recharge.
(Head's up!...as a moderator I will be moving this topic to a new thread so as not to further detour the Pirate Camp topic)