Energizer L91 Batteries (AA Ultimate Lithium)

Energizer L91 Batteries (AA Ultimate Lithium)

Energizer L91 AA Ultimate Lithium batteries are primary Lithium Iron Disulfide (Li-FeS2) cells that provide long runtime, a flat 1.5 V discharge profile, and reliable operation in extreme temperatures. They are leak-resistant and notably lighter than alkaline, reducing carry weight and maintenance for gear used in the field or on set.

When to choose L91

• Use if you need dependable power in cold or hot environments (−40°F to 140°F / −40°C to 60°C).
• Use for high-drain or pulse-drain devices (LED flashlights, wireless audio, sensors) where steady voltage matters.
• Use when weight savings help (headlamps, field kits)—each cell is about 33% lighter than alkaline AA.
• Avoid if you require rechargeable cells; choose NiMH (AA 1.2 V) or Li-ion (14500) when frequent recharging is expected.
• Avoid mixing with other chemistries in the same device (do not mix lithium with alkaline or NiMH).

Key advantages

• Long runtime in high-drain and intermittent pulse loads compared with premium alkaline.
• Consistent output: flatter discharge curve helps reduce dimming and false low-battery warnings.
• Cold-weather performance: maintains function well below freezing for outdoor devices.
• Low self-discharge and up to a 20-year shelf life when stored at room temperature.
• Leak-resistant construction to help protect devices during extended deployments.

Typical applications

• Outdoor and wildlife: trail cameras, GPS trackers, weather stations.
• Lighting: tactical and inspection flashlights, helmet lamps, headlamps.
• Tools and test: multimeters, laser measures, IR thermometers, stud finders.
• Smart home and security: motion sensors, sirens, keypads, door/window transmitters.
• Audio/film: wireless transmitters, portable recorders, timecode units.

Buying guide: pack formats

• Carded packs (2, 4, 8, 12): for field kits and point-of-use restocking.
• Bulk boxes (24, 48, 60, 72): for teams standardizing on L91 across devices.
• Master cases (96, 144, 240, 576): for multi-site facilities and scheduled maintenance.

Tip: Keep a mix—carded packs for grab-and-go, bulk for shop stock, and cases for central supply.

Technical characteristics

Deployment tips

• Standardize kits: label bins “AA Lithium” to prevent mixing with alkaline or NiMH.
• Rotate inventory: date-mark boxes and use the oldest first.
• Cold-weather prep: pair L91 with winter-rated headlamps or trail cams to reduce voltage drop issues.
• Plan by maintenance window: align case quantities with quarterly service cycles to minimize downtime.

Safety and handling

• Do not recharge, short-circuit, or disassemble.
• Insert with correct polarity; do not mix new and used cells.
• Store in original packaging in a cool, dry place away from conductive materials.
• Recycle or dispose of in accordance with local regulations.

FAQ