OVP Oil Vape Pen Battery for Pre-Filled 510 Cartridges is a conservative battery for use with pre-filled 510 cartridges with three power yield settings, and a 650 mAh battery limit. The majority of the OVP’s capacities can be accessed with a single catch. Five ticks on the OVP turns it on and off, three ticks modifies the voltage yield, and two ticks will activate the 15-second preheating capacity. The OVP will show three different hues to indicate the power yield: green is 3.4V, blue is 3.7V, and red indicates 4.0V of yield. This battery has a cartridge port diameter of 10.5mm, which is magnetically connected to the OVP. Mig Vapor’s Herb-e OVP is a discreet and capable battery choice.