3.7v 4000mah 4500mah 4800mah Cell 21700 Lithium Ion Batteries

Advantages

High Energy Density: Lithium-ion batteries have a high energy density, meaning they can store a large amount of energy in a small and lightweight package. This makes them ideal for portable devices.

Long Cycle Life: Lithium-ion batteries have a long cycle life, meaning they can be recharged and used many times before needing to be replaced. This makes them a cost-effective solution for devices that require frequent charging.

Low Self-Discharge: Lithium-ion batteries have a low self-discharge rate, meaning they retain their charge for a long time when not in use. This makes them ideal for devices that are used infrequently.

No Memory Effect: Lithium-ion batteries do not have a memory effect, meaning they can be charged and discharged at any time without affecting their overall capacity.

Wide Operating Temperature Range: Lithium-ion batteries can operate in a wide temperature range, making them suitable for use in both hot and cold environments.

Overall, the 3.7V 4000mAh lithium ion batteries are a reliable and efficient power source for a variety of devices due to their high energy density, long cycle life, low self-discharge, lack of memory effect, and wide operating temperature range.