9 V lithium. More (vs. Energizer Max) power for the devices you rely on. Up to 10 year back-up battery in AC powered smoke detectors. Ideal for smoke alarms, professional audio & home improvement devices. Lasts up to 20% longer (vs. Energizer Max) in toys. Lightweight (25% lighter than alkaline). Performs in extreme temperatures (-40 to 140 degrees F). Made in China.