Energizer Ultimate Lithium AA vs Energizer Ultimate e2 AA Cylindrical Lithium Battery

Both are Energizer lithium AA cells built for high-drain devices, and the Ultimate Lithium L91 is the stronger pick for most shoppers. It holds power up to 25 years, weighs about a third less than alkaline, and is rated for continuous 2.0 A discharge, which suits cameras, flashes, smart locks and outdoor sensors. The e2 is the older photo-focused line with a shorter 20-year storage life and a narrower pitch toward cameras and flash units. Owners of both report long runtimes and no leaks in normal use; the L91 is simply the more current, more versatile cell.

• Choose the Energizer Ultimate Lithium if you want the longest shelf life and the widest high-drain coverage, from smart home sensors to cameras and handheld games.
• Choose the Energizer Ultimate e2 if your main job is powering a camera or flash unit and you want the photo-specific cell Energizer built that line for.