The Genuine HP CQ775 Battery is a rechargeable lithium-ion battery designed specifically for HP Officejet 100 and 150 printers. With a capacity of 2100mAh and a voltage of 10.8V, this black battery is compatible with the models mentioned and is ideal for extended printing sessions without the need for frequent recharging. The California Prop 65 warning indicates that the battery contains chemicals that may pose a risk if not handled properly. Trust the HP brand to ensure a reliable and efficient power source for your printer.