Which lasts longer in a trail camera?

The Ultimate Lithium. Its 3,500 mAh capacity and steady voltage under load beat the E91's 2,850 mAh alkaline cell, and it keeps working below freezing where alkaline fades.

Is the Ultimate Lithium worth the extra cost?

Only for high-drain or long-storage use. At $41.00 at Amazon as of November 6, 2026 versus $5.48 at The Home Depot for the E91, the lithium pack costs several times more per cell.

Which is better for cold weather?

The Ultimate Lithium, rated from -40°F to 140°F. The E91 is rated only to -18°C (about 0°F) at the low end.

Can I use either in a remote control or wall clock?

Yes, but the E91 is the sensible pick. Low-drain devices do not benefit from lithium's extra capacity or cold tolerance.

How long can I store each one?

Up to 20 years for the Ultimate Lithium at 21°C, and 10 years for the E91. Store both cool and dry.

Energizer Ultimate Lithium AA vs Energizer E91 AA Alkaline Batteries

Buy the Ultimate Lithium if the batteries will sit unused for years, run in cold weather, or feed a high-drain device like a camera flash or trail camera. Buy the E91 alkaline if you need cheap AA power for remotes, clocks, toys and mice. The gap is wide right now: the E91 is $5.48 at The Home Depot as of November 6, 2026, while the Ultimate Lithium is $41.00 at Amazon as of the same date, though it traded as low as $11.39 on November 3, 2026.

Today the Energizer E91 AA Alkaline Batteries costs $35.52 less at its best price.

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