Energizer LN91 AA Industrial Lithium Batteries

Energizer LN91 are professional-grade, primary lithium (Li-FeS2) AA cells built for reliable power in scanners, meters, sensors, safety equipment, and portable instruments. They offer long runtime, excellent cold-weather performance, and low self-discharge to keep critical devices ready with fewer battery changes.

Why choose LN91

• Consistent power: Flatter discharge curve than alkaline for stable device performance.
• Works in extreme temperatures: Approximately -40°F to 140°F (-40°C to 60°C).
• Low self-discharge: Stores for years with minimal capacity loss (ideal for spares and emergency kits).
• Leak-resistant construction: Helps protect sensitive electronics during long service intervals.
• Lightweight: About 14–15 g per cell, typically lighter than alkaline (~23 g).

Best-fit applications

• Barcode scanners, portable POS, handheld data capture
• Industrial meters, telemetry, and asset-tracking beacons
• Security sensors, alarms, and access control devices
• Professional headlamps/flashlights used in cold environments
• Emergency and mission-critical kits that must work after long storage

Quick recommendations

• Use LN91 if you need long runtime, reliable cold-weather starts, or long shelf/storage life.
• Consider NiMH rechargeables if devices are used and recharged daily (e.g., warehouse scanners with docks).
• Choose alkaline only for very low-drain, room-temperature devices where lowest upfront cost is the priority.

Runtime examples (rule-of-thumb)

Actual results vary with device cut-off voltage, duty cycle, and temperature. Estimates assume a typical lithium AA energy of about 4.5 Wh.

Scenario	Approx. load	Estimated runtime
Wireless sensor (duty-cycled)	1 mA average	~3,000 hours (~4 months)
Handheld scanner (mixed use)	80 mA average	~35–50 hours
LED flashlight (medium)	300 mA	~10–15 hours
Pulsed radio device	200 mA average with bursts	~12–18 hours

Tip: For cold-weather use, expect shorter runtimes with alkaline; LN91 typically maintains much better capacity below freezing.

Technical details

• Chemistry: Lithium Iron Disulfide (Li-FeS2), primary (non-rechargeable)
• Size/format: AA (FR6, 1.5V nominal)
• Operating temperature: ~-40°F to 140°F (-40°C to 60°C)
• Typical energy: ~4.5 Wh per cell (application-dependent)
• Weight: ~14–15 g per cell
• Shelf life: Designed for long-term storage with low self-discharge; store cool and dry

Procurement and packaging

LN91 is available in bulk-friendly cartons and master cases for efficient stocking, plus smaller quantities for field kits. Select pack sizes based on device count and replacement intervals:

1. Devices × cells per device × expected replacements per period = base quantity.
2. Add 10–20% buffer for spares, field losses, and peak usage.

Example: 20 scanners × 2 AA × 3 swaps per quarter = 120 cells; add 15% buffer → order ~140 cells per quarter.

Pros and cons

• Pros: Long runtime vs. alkaline (especially in high-drain/cold), leak-resistant, wide temperature range, light weight, long storage life.
• Cons: Not rechargeable; higher upfront cost than alkaline; some devices may show less-accurate battery gauges due to flatter voltage curve; air shipping may have special handling requirements for primary lithium.

Compatibility and usage notes

• Works in most devices that accept standard AA batteries.
• Battery indicators calibrated for alkaline may drop suddenly near end-of-life due to the lithium discharge profile.
• Do not use in chargers or in devices that attempt to charge AA cells.
• Do not mix new and used batteries or mix chemistries/brands in the same device.

Safety

• Primary lithium—do not recharge, crush, short-circuit, or incinerate.
• Install with correct polarity; remove from equipment placed in long-term storage.
• Store in a cool, dry place away from metal objects; keep out of reach of children.
• Recycle or dispose in accordance with local regulations.

FAQ

Can LN91 replace standard AA alkaline batteries?

Yes. LN91 fits AA slots and provides 1.5V nominal. Expect longer runtime and better cold-weather performance than alkaline in most devices.

Are LN91 batteries rechargeable?

No. LN91 is a primary lithium battery and must not be recharged. For frequent cycling, choose quality NiMH rechargeables.

How do they perform in freezing conditions?

LN91 typically starts and runs devices at sub-zero temperatures where alkaline cells struggle, making them well-suited to outdoor and winter use.

How long can they be stored?

Primary lithium AAs have very low self-discharge and are designed for multi-year storage. Store cool and dry; avoid heat for maximum life.

Will my device’s battery gauge be accurate?

Some gauges assume an alkaline curve and may show a sudden drop near end-of-life with lithium cells. This is normal and not a fault with the battery.