Use: Due to the large capacity of the unit density, it is often used in most notebook batteries, in addition to high-grade torches, portable power (mobile phone portable charger) and so on.
Size: 18650 is the number that represents the external size: 18 means the diameter of the battery 18.0mm 650 means the height of the battery 65.0mm.
Types: 18650 batteries have lithium-ion batteries and nickel-hydrogen batteries, as nickel-hydrogen is now used rarely, so now say 18650 batteries, no special instructions, is the batch of 18650 lithium-ion batteries.
Voltage and capacity specifications: NiMH battery voltage is 1.2V common capacity of 4500MAH
Lithium-ion battery voltage of 3.6V-3.7 common capacity of 1500MAH-2600MAH, now the highest capacity of 3000MAH.
18650 Li-ion battery requirements
18650 Li-ion batteries, in terms of weight, volume and capacity have a great advantage over the 5 batteries now commonly used. If a 2400MAH 18650 battery, the voltage is calculated by the standard 3.7V, the power is 8880MWH. now the best Sanyo 5 rechargeable battery ENELOOP, capacity 2000MAH, voltage is 1.2V, power is 2400MWH. it can be seen that a good 18650 battery, power capacity is close to 4 times that of a 5 battery.
18650 lithium-ion battery capacity is generally 1200mah ~ 3600mah, while the general battery capacity is only about 800, if the combination of 18650 lithium-ion battery to become 18650 lithium-ion battery pack, that 18650 lithium-ion battery pack is casually can break through the 5000mah.
18650 lithium-ion batteries have a long service life, with a cycle life of 500 times or more in normal use, which is more than twice that of ordinary batteries.
The voltage of 18650 Li-ion batteries are generally at 3.6V, 3.8V and 4.2V, much higher than the 1.2V of NiCd and NiMH batteries.
18650 Li-ion batteries have high safety performance, no explosion, no combustion; non-toxic, non-pollution, certified by RoHS trademark; various safety performance in one go, cycle times greater than 500 times; good high temperature resistance, discharge efficiency up to 100% at 65 degrees. To prevent the short-circuit phenomenon of the battery, the positive and negative electrodes of the 18650 Li-ion battery are separated. Therefore, the possibility of short-circuiting is reduced to a minimum. A protection plate can be added to prevent the battery from being overcharged and overdischarged, which also extends the life of the battery.