Rectangular aluminum shells are mainly used in mobile phone and camera batteries, such as Nokia BL-5C and BL-4C batteries.
Polymer, this type is mainly used in Bluetooth headsets, MP3/MP4, portable microcomputers, etc. It is also useful for mobile phones and cameras, such as Sony Ericsson batteries.
Cylindrical, this type is mainly used in laptops, power tools, cameras, etc. Most laptops use 18650 cylindrical shapes, with capacities between 1800 and 2300 or more.
Early R&D
Lithium batteries were first used in pacemakers. Lithium batteries have the advantages of extremely low self-discharge rate and gentle discharge voltage, allowing stimulators toardiacs implanted in the human body to function for a long time without recharging. Lithium batteries typically have a voltage rating above 3.0 volts and are best suited for use as an integrated circuit power supply. Manganese dioxide batteries are widely used in calculators, digital cameras and watches.
Is the capacity clearly marked? Batteries without clearly marked capacity (such as 1000 mAh or 1000 mAh) are most likely using lower quality batteries or recycled batteries. Many inexpensive batteries on the market are made from recycled batteries. Although they are cheap, their lifespan is short and their unstable quality can damage the phone.