1. Built-in 5Pcs INR18650 Battery cells . 2DIY The capacity for your Machine battery . 3High quality for use 4High compatibility with device and more durable 5Help to repair and assemble batteries pack. Battery protection board with single cell protection detection BMS Features: 1Latest upgrade circuit board with single cell balance detection function, can make every cell charged and discharged balance, effectively prevent every cell over-charge and over-discharge 2Built-in memory chip and cpu, can automatically set the battery charging effect, protect the battery 3Safeguard features against incorrect voltage, short circuit, internal overheating. 4High quality material case, strong and durable with Shockproof design. 5LED indicator, can know the remaining any time. 6BL1860b Provides up to 23 times more run time per charge than the 30Ah battery. Type: Battery Storage Box color:As shown Material:Plastic + Metal Package Contents: 1 x Battery Case Kit Only the above package content, other products are not included. Note: Light 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.