100% Authentic Demonfire 10440 Rechargeable Li-Ion Button-Top Batteries (4-pack) Specifications: Capacity: 600mAh Nominal Voltage: 3.7V Dimensions: 46.1±0.2mm Length, 10.3±0.2mm Circumference Operating Discharge Temperature: -20 to 60 Degrees Celsius Standard Charge: 0.2C CC/CV to 4.2V, current ≤ 0.01C cut-off Cycle Life: ≥300 cycles Weight Per Battery: 8g Package Includes: 4 Brand New Demonfire 10440 600Mah Batteries 2 Quad Battery Cases (holds up to 8 batteries total) Recommended charger for Demonfire batteries: Demonfire D1 Battery Charger