- The first choice for smoke detectors. - The VARTA 9V lithium battery contains no mercury, lead or cadmium. - Last up to 5 times longer than usual 9V Alkaline and 10 times longer than carbon-zinc batteries. - Works outstandingly at extreme temperatures from -20°C up to +60°C. - Can be stored up to 10 years without leakage. Due to increasing demand for fire prevention, there will be a need for extremely long performing batteries in the future. The main reasons why VARTA Professional 9V Lithium will be the best choice for your smoke alarm: Outstanding quality, 10 years shelf life and up to 40% better performance than comparable batteries from competitors.