Energizer E91 Max (AA)

Energizer E91 Max (AA) — Practical Guide

Energizer E91 Max is a standard 1.5V alkaline AA battery designed for everyday electronics. It prioritizes reliability, long shelf life, and leak-resistant construction for common household and office devices.

Specs at a Glance

Chemistry	Alkaline (zinc–manganese dioxide)
Size / Format	AA (LR6), 14.5 × 50.5 mm
Nominal Voltage	1.5 V
Shelf Life	Up to 10 years (at room temperature, in package)
Operating Temp	Approx. -18°C to 55°C (0°F to 130°F)
Typical Weight	~23 g per cell
Leak Resistance	Leak-resistant design to help protect devices

Note: Alkaline capacity varies with load and cutoff voltage; manufacturers do not publish a single fixed mAh rating. Effective capacity decreases at higher drains.

Best For vs. Not Ideal

• Use if: You need dependable batteries for low-to-moderate drain devices such as TV remotes, wireless keyboards/mice, clocks, basic LED flashlights, radios, and children’s toys.
• Avoid if: You’re powering high-drain or frequently used gear (e.g., photo flashes, gaming controllers used daily, motorized toys, action cameras) — consider AA NiMH rechargeables. For cold weather, high-drain, or long-term field use, consider AA lithium (e.g., L91) for lighter weight and better cold performance.

What to Expect: Runtime Estimates

Actual runtime depends on device design, power draw, and cutoff voltage. These broad ranges assume typical consumer devices in good condition:

• TV remote: 6–24 months per set (light use).
• Wireless keyboard: 6–18 months; wireless mouse: 2–6 months.
• Game controller (2×AA): ~20–40 hours of active play.
• LED flashlight (2×AA, ~100–200 lm): ~3–10 hours on high; longer on lower modes.
• Motorized toys: ~30–90 minutes, depending on load and number of cells.

Alternatives and When to Pick Them

• AA Lithium (e.g., L91): Choose for extreme cold, infrequent but critical use (emergency kits), lighter weight, and better high-drain performance. Costs more but lasts longer in demanding scenarios.
• AA NiMH Rechargeable (e.g., 1900–2500 mAh): Best for anything you use often or that draws higher current (cameras, controllers, flashes, toys). Higher upfront cost but lowest cost per cycle and less waste.

Compatibility Notes

• Works in any device that specifies AA (LR6) alkaline cells.
• For devices that sit on standby for years (e.g., some detectors or emergency lights), check the manufacturer’s recommendation; lithium AAs often provide longer service intervals.
• Do not mix with other chemistries (lithium, NiMH) or mix old and new cells in the same device.

Storage and Handling

• Store in a cool, dry place (ideal 10–25°C / 50–77°F). Keep in original packaging until use. No refrigeration needed.
• Insert with correct polarity. Remove batteries from devices you won’t use for months.
• Do not recharge, crush, or short-circuit. Keep away from small children.
• Dispose or recycle according to local regulations; recycling is preferred where available.

Buying Tips

• Available in single, 4–8 pack for households, and larger economy packs for offices or classrooms.
• Check the date code to ensure fresh stock if you plan long-term storage.

FAQ

How long do E91 Max AA batteries last in storage?

Up to 10 years when stored at room temperature in original packaging.

Can I recharge these batteries?

No. E91 Max are non-rechargeable alkaline cells. Use AA NiMH rechargeables if you want to recharge.

Are they safe for all AA devices?

Yes, for devices that specify AA alkaline. For high-drain or cold environments, lithium AAs may perform better.

Do they leak?

They use a leak-resistant design to help protect devices, but any battery can leak under misuse or prolonged discharge. Follow storage and handling tips to reduce risk.

What’s the typical capacity in mAh?

Alkaline capacity depends heavily on load and cutoff and is not represented by a single fixed mAh value. Expect higher apparent capacity at low drains and less at high drains.