A lithium battery cell is 4.2V when fully charged, 3.7V for storage or at half discharged power and is 3.2V when it should be disconnected
snaptube vidmate from its load. A lithium battery cell less than 3.2V is damaged and below 2.5V it is destroyed and is dangerous to attempt charging.
Many products have a circuit that displays the percentage of remaining charge. Then 3.2V will show 0%, 3.7V will show 50% and 4.2V will show 100%. You should not store a lithium battery cell at 3.2V because its self discharge might cause its voltage to go lower. Store it at 3.7V for years.