I bought a battery for my laptop from a local store. When I inserted it into my laptop and tried to power it on, I noticed that it was deeply discharged. Then I connected charger and then it started charging. To check the battery state I powered it on and found out that battery percentage was zero. Then I left it for 2 hours and when I came back it was fully charged. Then I checked battery health statics and it was reported that battery is 100% healthy and has charged up to its nominal capacity.
Now I've these questions.
Is this battery damaged due being stored in this state for a period of time? If so then why statics report that it's 100% healthy?
What is the proper way to store li-ion batteries in warehouse as they have a self-discharge rate which leads to be fully discharged eventually even if they are 40% charged before storing them?
Does storing battery unused in a warehouse, reduce its 2 - 3 years lifespan?
EDIT: I just checked one of my old laptops and figured out its battery was also 0% and now does not respond and doesn't recharge. Battery was detached and had been charged to 40% before being detached.