1. Built-in 5Pcs INR18650 Battery cells . 2.DIY The capacity for your Machine battery . 3.High quality for professional use 4.High compatibility with device and more 5.Help to repair and assemble batteries pack. Battery protection board with single cell protection detection Features: 1.Latest upgrade circuit board with single cell balance detection function, can make every cell and discharged balance, effectively prevent every cell over-charge and over-discharge 2.Built-in memory chip and cpu, can automatically set the battery charging effect, protect the battery 3.Safeguard features against incorrect voltage, short circuit, internal overheating. 4.High quality material case, strong and with Shockproof design. 5.LED indicator, can know the remaining power any time. 6.BL1860b Provides up to 2.3 times more run time per charge than the 3.0Ah battery. Type: Battery Storage Box color: As shown Material: Plastic + Metal Package Contents: 3 x Battery Case Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.