According to a vendor, it is 750 mAh capacity; I use them for smoke alarms (hardwired installed) and haven't replaced one yet. Generally standard 9v batteries would die after a power outage, ive replaced them all with lithium no problems in since.

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Energizer Ultimate Lithium 9V Batteries (2 Pack), Lithium 9 Volt Batteries

Energizer Ultimate Lithium 9V Batteries (2 Pack), Lithium 9 Volt Batteries

Q: are these l522bp-2 the same as advance lithium l522 ?

Nope, different. "9V Ultimate lithium" are Energizer's current product. Energizer '9V Advanced lithium' has been discontinued so I'd bet that those are old stock. Be sure to check the expiration date. BP-2 just indicates there are two batteries in each individual package. No designation, A plain BP, or Bp-1 would indicate a single battery per package. BP4 would be a 4 pack, etc.

Q: Life span in smoke alarms?

Lasted only 1 year 5 months in my smoke detector.

Q: Is there any chance of these batteries used in a smoke detector exploding and causing a fire?

Virtually none. This type of battery constuction is by far the most stable of all common types. These are much safer and more stable than NiMH such as rechargeables or "standard" batteries which are generally Alkaline. I use these in any sensitive devices or devices not used often but important. As such I use these in my own smoke detectors and have never had any issue. For what it is worth I've been a FireFighter for 25+ years, so yes they are safe. The one thing to be aware of is that if your smoke detector is hard wired and requires a rechargeable battery as a backup power source then do not use these. These are not rechargeable batteries.

Product ID: 27498933

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Details

Number of Batteries
2 Lithium
Brand
Energizer
Battery Cell Composition
Lithium Metal
Battery Capacity
750
Recommended Uses For Product
Camera

⚡20% longer life vs MAX

🕰️10-year shelf life

❄️🔥Works -40°F to 140°F

Frequently Bought Together

Energizer Ultimate Lithium 9V Batteries (2 Pack), Lithium 9 Volt Batteries

Energizer Ultimate Lithium AA Batteries Pack, 1.5V AA Batteries, 24 Count

Energizer AA Batteries, Ultimate Lithium Double A Battery, 8 Count

Description

⚡ Power that lasts through every season, so you never miss a moment!

VERSATILE READY - Ideal for toys, clocks, and smoke detectors—always ready when you need it
UNMATCHED LONGEVITY - Outlasts Energizer MAX by 20% for extended device uptime
LIGHTWEIGHT POWERHOUSE - Compact 9V design that’s easy to handle without sacrificing strength
LEAK RESISTANT DURABILITY - Engineered to prevent leaks, protecting your valuable devices
EXTREME TEMPERATURE RESILIENCE - Reliable performance from -40°F to 140°F, no matter the season

Energizer Ultimate Lithium 9V Batteries deliver 20% longer life than Energizer MAX, operate reliably in extreme temperatures from -40°F to 140°F, and feature leak-resistant construction. Lightweight and with a 10-year shelf life, these batteries are perfect for toys, clocks, and smoke detectors, ensuring dependable power whenever and wherever you need it.

Have a Question? See What Others Asked

what is the mah?

are these l522bp-2 the same as advance lithium l522 ?

Life span in smoke alarms?

Is there any chance of these batteries used in a smoke detector exploding and causing a fire?

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