The 18650 cell is one of lithium ion rechargeable batteries. To avoid the overcharging or over-discharging common dangers, a lithium ion battery is commonly provided with a protection circuit that protects the battery from these dangers.
Some 18650 batteries has an integrated electronic circuit for battery protection in the finished batteries, such as LI18650JL PROTECTED from Jauch Quartz.
The size of protected 18650 battery may be larger than the typical 18650, so you should be
aware the dimension if you are looking for the 18650 battery holder.
One of 18650 battery holder examples is BH-18650-PC from MPD (Memory Protection Devices). Its drawing shows that βThis battery holder is designed for use with protected 18650 batteries (PCB)β.
