This contractor pack of Ultralife Lithium U9VL JP 9V batteries is ideal for industrial applications; these batteries are designed to withstand extremes of temperature, making them suitable for security applications such as smoke alarms, carbon monoxide alarms and motion sensors. They are also chemical resistant. Lithium batteries boast an extremely long life; this makes them ideal for security equipment, as they will continue to provide stable power until the battery is fully discharged. Each battery weighs 35 grammes; this makes the unit ideal for hand-held devices where light weight is desirable. The Ultralife series of batteries has a storage life of up to 10 years; this makes them ideal for use by security organisations where ready replacement batteries are needed. .