This Delta9 Omicron 14650 IMR Battery is designed for use with the Omicron v2 and v2.5 models. Tips: 1) Use only the highest quality batteries. 2) Always use batteries that are of the same brand, same charging state and similar age. 3) NEVER use a depleted battery combined with a full battery in the same device. 4) Recharge batteries when they are low, don't torture them to the end. 5) Do not drop or damage your batteries. 6) Turn off a device that gets too hot to hold and remove the batteries ASAP.