ER9V We are one of the most famous manuafacturers dealing with lithium battery .   Nominal capacity(0.5mA-6.0v): 1200mAh Nominal voltage: 10.8V Max. constant current: 50mA Max.pulse current: 100mA Weight: 40g Volume: 17.8*27.5*49.8mm Workable temperature: -55~+85   Applications in Security/ smoke alarm /sensors Applied mainly in long  operating Life (above 5-10  years). Forte ER9V and CR9V lithium battery to cross for Ultralife 9V lithium battery from USA.