[Product Specification] Battery Type: Li-Ion, Voltage: 12V, Capacity: 4000mAh/4.0Ah, Quantity: 2 packs Replacement for Dremel 12V Max Battery. No pollution, and low self-discharge, can be charged or discharged as needed without loss of capacity. [Widely Compatibility] Replacement for Dremel 12V Lithium-Ion cordless tools 8240, 8250 and 8260. Not compatible with Dremel 8220. [Stability & security] Premium Lithium battery cells.Battery can be recharged at any time without memory effect. Battery comes with protective design. Protect against over-charge, over-discharge, over-voltage, over-heating and short-circuit. it is safe and stable to use. [Safety & Reliable] Stand with CE, FCC and ROHS safety certification, built-in top A battery cells to provide a longer battery life and optimized performance.A right choice for high cost performance. [Professional After-Sale Service]One year & 24-hour friendly customer service ,conditional refund or replacement for a new battery if there is any quality problem.Any problem with using the battery, please feel free to contact us.