Best if used in a regulated (has a chip) box mod. Mechanical devices are not toys! Understand the relationship between the battery output and the ohms (resistance) of the atomizer. Saveonvapes.com and affilietes are NOT responsible for the possible dangers and misuse of devices. MXJO 18650F 3500mah 20A high drain rechargeable battery Specifications -Capacity: 3500mAh -Nominal Voltage: 3.7V -Continuous Discharge Current: 10A -Max. Pulse Discharge Current: 20A -Dimensions : 64.75*18.26MM (+/-0.05)mm -Operating Discharge Temperature: -10 to 60 Degrees Celsius -Standard Charge : CC/CV 1A, 4.20 ± 0.05 V -Cycle Life: 300 cycles -Weight: 60g Authentication code Check it on www.mxjotech.com Warning -Do not heat above 100? or 212?. -Battery may explode or catch fire if mistreated. -Do not disassemble or incinerate. -Do not expose to water or fire. -Do not short circuit. -Do not place loose batteries in a pocket, purse, or other receptacle containing metal objects -Do not over-discharge/overcharge, if allowed to drop past2.5 volts, chargers will no longer be able to charge these batteries. -Keep away from children.