High Quality Rechargeable 18650 Type Battery

An 18650 battery is a type of lithium-ion rechargeable battery, classified by 18*65mm size. It is commonly used in electronic device. 18650 battery is known for the high energy density, long lifespan, relatively low self-discharge rate.

GPS tracker can be powered on by 18650 battery. It helps the tracker keep working without the 12V car battery. 

Lithium-ion rechargeable battery. 

Applied to GPS tracker as the power supply.

18650 battery: 18mm in diameter, 65mm in length. 

Lithium-ion rechargeable battery.