The latest classic battery with a longer lasting 320 mAh Battery. Best4ecigs Classic 320 Battery Best4ecigs have upgraded their best selling automatic battery. The New Classic now comes with a more powerful, longer lasting 320mAh battery and new common 510 thread. The Classic also comes with: * overcharging protection * short circuit protection* overcurrent protection* low voltage protection (battery cut off under 2.8V) For use with 510 thread Black and Silver Tip Refill Cartridges and E-liquid Cartridge-Clearo. Battery Length: 79mm. Diameter: 95mm Comes complete with Best4ecigs 30 day Warranty