Energizer Ultimate lithium battery L91 AA 1.5V (blister pack of 2) - L91ULTIMATEB2

Energizer Ultimate Lithium L91 (size AA / Mignon) in a compact Pack of 2 is the ideal pack size for devices that use batteries in pairs, such as many digital cameras, handheld GPS devices or smart home cameras. It is regarded as the world’s longest-lasting AA battery for use in high-tech devices. Thanks to its superior lithium iron sulphide (LiFeS2) chemistry, it offers extremely stable voltage, weighs a third less than alkaline batteries and withstands extreme temperatures at which standard batteries would have long since failed.

Key features at a glance

• The world’s longest-lasting AA battery: It offers unrivalled endurance in power-hungry devices and, in digital cameras for example, lasts up to 11 times longer than standard alkaline batteries.
• 20-year shelf life: The extremely low self-discharge rate ensures that the batteries are still ready for use even after two decades in storage – perfect as a contingency supply.
• Extreme temperature range: It works reliably from Siberian -40 °C to desert-like +60 °C, making it the standard solution for outdoor sensors and CCTV cameras in winter.
• Ultra-light: It weighs approx. 33 % less than an alkaline battery (approx. 14.5 g vs. 23 g), which noticeably reduces the weight carried when using headlamps and handheld GPS devices.
• Leak-proof: Its advanced design prevents liquid leakage, thereby providing long-term protection for valuable electronics against corrosion damage.
• 100 % compatible: It has the exact dimensions of a standard AA battery and delivers 1.5 volts, so it can directly replace any standard ‘Mignon’ battery.

The standard for Blink cameras & GPS

This 2-pack is perfectly tailored to the needs of devices that usually require two cells. These include, in particular, the popular Blink Outdoor cameras (Amazon), which explicitly specify 1.5V lithium batteries to achieve the stated battery life of 2 years. Also for Garmin handheld GPS (e.g. GPSMAP, eTrex), it’s ideal as it makes the device lighter and works reliably even in sub-zero temperatures in the mountains.
 

Features

FAQs on the Energizer Ultimate Lithium L91

Why is this battery so expensive compared to alkaline ones?

The price reflects the more sophisticated lithium technology and the performance. As a Energizer lithium battery in high-tech devices can last up to 11 times longer than a standard alkaline battery, you’ll need to buy new batteries much less often. If you work out the cost per photo (for cameras) or per hour of use, the lithium battery is often even cheaper – and you’ll save yourself the hassle of constantly changing them.

Can I use them in an LED torch?

Yes, absolutely. It’s actually highly recommended. On the one hand, the torch becomes lighter; on the other, the brightness remains more consistent throughout the battery’s lifespan (a flatter discharge curve). What’s more, the torch will still work even if left in a cold car in winter (-20 °C), whereas an alkaline battery often fails in such conditions.

Is it dangerous?

No, it is very safe when used correctly. It has built-in safety valves (PTC) which cut off the current in the event of a short circuit to prevent overheating. However, as with all lithium batteries: do not throw them into a fire, do not open them and do not recharge them.

Does it fit in the Apple Magic Mouse?

Yes. The older generation of the Apple Magic Mouse (which still requires batteries) uses 2x AA batteries. The Energizer L91 is perfect for this, as it makes the mouse lighter, which reduces gliding resistance and is easier on the wrist. It also lasts considerably longer than the standard batteries supplied.