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The Energizer Ultimate Lithium AA is a single-use lithium battery built for devices that drain alkalines fast: cameras, flashes, game controllers, smart locks, outdoor sensors and headlamps. It is lighter than an alkaline AA, holds up in cold weather and is rated for up to 25 years of storage, so it works as a long-term reserve. Against alkaline AAs it lasts longer in high-drain gear and resists leaking, but it is not rechargeable and costs more per cell than alkalines or NiMH rechargeables. Owners value it most for gear left unused for months and for cold-weather use.
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Owners and reviewers treat these as the go-to AA for gear that eats batteries, especially cameras, flashes and outdoor sensors. The main complaints are the price per cell and that they are wasted in low-drain devices.
The Energizer Ultimate Lithium AA (L91) is a lithium AA battery made for high-performance devices. It is described as Energizer's longest-lasting AA battery. It can power smart home systems, outdoor surveillance cameras, digital cameras, handheld games, flashlights and emergency kits.
The batteries have a leak-proof construction that helps protect the devices they power, even with regular use.
The shelf life is up to 25 years, so the batteries can be kept in storage as a backup power source at home or while traveling.
