It is generally believed that when the no-load voltage of the lithium battery is below 3.0V, it is considered that the battery is out of power (the specific value depends on the threshold value of the battery protection panel, for example, there are as low as 2.8V and 3.2V). Most lithium batteries cannot be discharged with the no-load voltage below 3.2V, otherwise excessive discharge will damage the battery (generally, lithium batteries in the market are only used with a protective plate, so excessive discharge will also cause the protective plate to fail to detect the battery and thus fail to charge the battery).

4.2V is the maximum limiting voltage for battery charging. It is generally believed that when the no-load voltage of the lithium battery reaches 4.2V, it is considered that the battery is fully charged. During battery charging, the battery voltage gradually rises to 4.2V at 3.7V. The lithium battery cannot charge the no-load voltage to more than 4.2V, otherwise it will damage the battery. This is a special feature of lithium batteries. Generally speaking, 18650 lithium batteries have the following advantages.

1. Wide range of use

Notebook computers, walkie talkies, portable DVDs, instruments, audio equipment, aircraft models, toys, video cameras, digital cameras and other electronic equipment.

2. Tandem

The 18,650 lithium battery pack can be combined in series or parallel.

3. Small internal resistance

The internal resistance of polymer cells is smaller than that of ordinary liquid cells. The internal resistance of domestic polymer cells can even be less than 35m Ω, greatly reducing the self consumption of batteries, extending the standby time of mobile phones, and fully reaching the level of international standards. This polymer lithium battery which supports large discharge current is an ideal choice for remote control model and is the most promising product to replace nickel metal hydride battery.