The UNI 650mAh Universal Carto Battery typically refers to the Yocan UNI series, a line of universal portable box mods designed specifically for 510-threaded oil cartridges. These devices are notable for their patented adjustable height and width settings, allowing them to fit almost any cartridge on the market.Key SpecificationsBattery Capacity: 650mAh internal rechargeable battery.Dimensions: Approximately 74.5mm x 33.9mm x 25.3mm.Universal Compatibility: Features an adjustable atomizer diameter dial (6mm–12mm for standard models, up to 16mm for newer versions) and a sliding height adjustment knob.Connection: Uses a magnetic 510-thread adapter for quick cartridge installation and removal.Charging: Recharges via Micro-USB or USB-C (depending on the specific version) in about 60 to 120 minutes.Core FeaturesVariable Voltage:The Standard UNI features three preset power levels indicated by LED lights.The UNI Pro offers precise digital voltage adjustment from 2.0V to 4.2V in 0.1V increments.The UNI 3.0 allows for precise control from 1.8V to 4.2V.Preheat Mode: A 10-second preheating function (activated by a double-click) coaxes smooth draws from thicker oils or clogged cartridges.Display Options: While basic models use LED indicators, the Pro and 3.0 versions feature OLED or HD animated screens that display battery life, voltage, and puff counts.Safety Protections: Includes built-in safeguards such as a 15-second safety cutoff, short-circuit protection, and low battery alerts.