These Kanger EVOD batteries are available in 1000mAh. The EVOD battery generates a constant power output of 3.7 volts. Fully charged, it should give you a thousand puffs, which lasts an average user a good day or two. It also makes an excellent back-up battery for experienced vapers or a starting battery for new e-cig users. These eGo style EVOD batteries are compatible with virtually all popular manufacturers’ clearomizers, glassomizers, and cartomizers.