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.

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: 321590963

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Details

Number of batteries
2 Lithium
Brand
Energizer
Battery cell composition
Lithium Metal
Battery capacity
9 Volts
Recommended uses for product
Camera

⚡20% longer life in toys

🕒10-year shelf life

❄️🔥Works from -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 outlasts the rest—because your devices deserve the ultimate boost!

DECADE LONG BACKUP - Holds power for up to 10 years in storage—always ready when you need it most.
UNMATCHED LONGEVITY - Lasts up to 20% longer than Energizer MAX in toys—stay powered when it counts.
LIGHTWEIGHT POWERHOUSE - 25% lighter than standard alkaline batteries—easy to handle, hard to beat.
LEAK RESISTANT DURABILITY - Engineered to prevent leaks—protect your valuable electronics with confidence.
EXTREME TEMPERATURE RESILIENCE - Reliable performance from -40°F to 140°F—your devices never miss a beat, no matter the season.

Energizer Ultimate Lithium 9V Batteries deliver 20% longer life in toys compared to Energizer MAX, operate flawlessly in extreme temperatures from -40°F to 140°F, and feature leak-resistant construction. These lightweight batteries hold power for up to 10 years in storage, making them the ideal choice for toys, clocks, and smoke detectors that demand reliable, long-lasting energy.

Specifications

Product Name	9v-batteries
Units	2.0 count
Brand	Energizer
Format	Discrete Subunit
Country of origin	China

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?

Reviews

F**S

Good

3.03.2025

A**R

How good are they

This type of battery is the only one I use in any size, they are the only batteries that have NEVER LEAKED ,long shelf life.

30.11.2024

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