Can built-in 10Pcs INR18650 battery cells. DIY The battery capacity of your machine. High quality for professional use. High compatibility with the device and more. Helps to repair and assemble the battery pack. Battery protection board with single cell protection detection. Noted: Please built-in high quality INR18650 30A discharge battery cells. Battery Features: Latest upgrade circuit board with single cell balance detection function, make each cell charged and discharged, effectively prevent cell overcharge and overdischarge. Built-in memory chip and CPU can automatically set the battery charging effect, protect the battery. Safeguard features against incorrect voltage, short circuit, overheating internal. High quality material case, solid and with shockproof. LED indicator, can know the remaining power at any time. BL1860b Provides up to 2.3 times more runtime per charge than 3.0Ah battery. Replacement battery codes: 194204-5 194205-3 194309-1 194230-4 BL1815 BL1830 BL1840 BL1850