It all has to do with how lithium-ion batteries work. When you charge a lithium-ion battery, the lithium ions move from the negative electrode to the positive electrode. This creates an imbalance in the electrons and causes degradation of the battery over time. The good news is that there are ways to help prolong the life of your lithium-ion
If your battery is actually damaged, you can repair it yourself with a soldering iron (and a little confidence). Again, I must warn you that dealing with batteries and electronic devices carries some inherent risk, so proceed with caution. The battery cell in the video below is a rechargeable lithium-ion cell from a laptop battery pack.
The capacity of a battery in an application will depend on the device drain rate and the cutoff voltage. In general, lithium coin cells are more efficient at lower drain rates. Device circuitry that has a high cutoff voltage (i.e. greater than 2 volts) will leave capacity unused in the battery when the device stops working. 1.6 1.8 2.0 2.2 2.4
A full discharge is 100% DoD. DoD is inversely related to state of charge (SoC), which is how much charge remains in the battery. 100% DoD = 0% SoC. With this understanding of DoD and a battery’s cycle, you may be left wondering what truly classifies as a deep discharge. A deep discharge is classified as 80% to 100% of capacity discharged

Modern devices use Lithium Ion batteries, which work differently and have no memory effect. In fact, completely discharging a Li-ion battery is bad for it. You should try to perform shallow discharges -- discharge the battery to something like 40-70% before recharging it, for example.

Let’s have a look at 12Vlithium iron phosphate batteries, such as the Renogy lifepo4 battery , often used in solar applications. A fully charged 12V lithium iron phosphate battery should read between 13.4 Volts and 13.6 Volts at rest. However, it's worth noting that these readings may vary depending on the specific manufacturer and model of YbGfis.
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    • lithium ion battery drain completely