Energizer Ultimate Lithium 9V batteries deliver outstanding performance and reliability. I use them in smoke detectors and other critical devices, and they last significantly longer than regular alkaline batteries. They provide consistent power, even in extreme temperatures, and give great peace of mind. A bit more expensive, but absolutely worth it for safety and long-term use.

These batteries last much longer than others I’ve tried. I use them in my remote controls and they still work perfectly after weeks. Great value for the price!

Excellent longevity: they last far longer than standard alkaline batteries. Wide operating temperature range: (‑40 °F to 140 °F or about ‑40 °C to +60 °C), making them suitable for cold weather/outdoor use.  Lightweight: As lithium primaries, they are lighter than comparable alkaline cells (useful if weight matters).  But these batteries cost significantly more than standard alkaline batteries.

Energizer lithium batteries are the highest quality and longest lasting batteries ive used. The 9 volt battery isn't used alot anymore but anything I need that has one, I always use this battery. Great cost for the battery life as well.