Discharge depth and rechargeable times of lithium batteries

From the experimental data in Figure 1, it can be seen that the number of rechargeable times is related to the depth of discharge. The deeper the discharge depth of the battery, the less the number of rechargeable times.
Rechargeable times * Discharge depth=Total charging cycle completion times. The higher the total charging cycle completion times, the higher the battery life, i.e., the charging times * Discharge depth=Actual battery life (ignoring other factors)
Influencing factor 2: overcharge, overdischarge, and large charging and discharging currents
Avoid overcharging the battery. Any form of overcharging of lithium ion batteries can cause serious damage to battery performance, even explosion.
Avoid deep discharges below 2V or 2.5V, as this can quickly and permanently damage the lithium ion battery. Internal metal plating may occur, which can cause short circuits, making the battery unusable or unsafe.
Most lithium ion batteries have an electronic circuit inside the battery pack. If the battery voltage is below 2.5V, exceeds 4.3V during charging or discharging, or if the battery current exceeds a predetermined threshold value, the electronic circuit will disconnect the battery.
Avoid large charging and discharging currents, as they exert excessive pressure on the battery.