min voltage is 2.8v, not 3v . This is min, not recommended if you want it last .
You can go below that & still have a usable batt
You can leave the batt fully charged for 9months+ & still have a usable batt (dont ask how I know)
Or you can follow correct batt procedures & still have it fail in 6 months
If it works, keep it as a spare/practice/fun/basher batt.
A usuable batt is not the same as a race spec batt
Also, get a low voltage beeper, thats the best $10 you'll spend. Stop AS SOON AS IT BEEPS , as voltage can drop rapidly after that.