Fangrui Product Details Built-in 10pcs Inr18650 Battery Cells. Diy The Capacity For Your Machine Battery. High Quality For Professional Use. High Compatibility With Device And More Durable. Help To Repair And Assemble Batteries Pack. Battery Protection Board With Single Cell Protection Detection. Noticed :please Built-in High Quatlity Inr18650 30a Discharge Battery Cells. Battery Features: Latest 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. Built-in Memory Chip And Cpu, Can Automatically Set The Battery Charging Effect, Protect The Battery. Safeguard Features Against Incorrect Voltage, Short Circuit, Internal Overheating. High Quality Material Case, Strong And Durable With Shockproof Design. Led Indicator, Can Know The Remaining Power Any Time. Bl1860b Provides Up To 2.3 Times More Run Time Per Charge Than The 3.0ah Battery. Battery Codes: 194204-5 194205-3 194309-1 194230-4 Bl1