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.

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.

Life span in smoke alarms?

Lasted only 1 year 5 months in my smoke detector.

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.

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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

Product ID: 27498933

Details

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

⚡20% longer life vs MAX

🕰️10-year shelf life

❄️🔥Works -40°F to 140°F

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552 DH

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Details

Battery Capacity
750
Battery Cell Composition
Lithium Metal
Brand
Energizer

Description

⚡ Energize your essentials with unstoppable power!

POWER THAT OUTLASTS - Lasts up to 20% longer in toys vs. standard alkaline batteries—stay ahead of the pack.
VERSATILE TRUSTED - Ideal for toys, clocks, and smoke detectors—your go-to battery for work, play, and safety.
EXTREME TEMPERATURE READY - Reliable performance from -40°F to 140°F—no season or climate can slow you down.
LEAK RESISTANT DURABILITY - Engineered to resist leaks, protecting your devices and your peace of mind.
LIGHTWEIGHT LONG LASTING - 25% lighter than alkaline batteries with a decade-long shelf life—carry less, power more.

Energizer Ultimate Lithium 9V Batteries deliver up to 20% longer life in toys, operate flawlessly in extreme temperatures from -40°F to 140°F, and feature leak-resistant construction. Weighing 25% less than alkaline batteries, they hold power for up to 10 years in storage, making them the ultimate choice for reliable, long-lasting energy in toys, clocks, and smoke detectors.

Specifications

ASIN	B01684J7P0
Antenna Location	Camera
Battery Capacity	750
Battery Cell Composition	Lithium Metal
Battery Cell Type	Lithium Metal
Battery Weight	100 Grams
Best Sellers Rank	#24,436 in Health & Household ( See Top 100 in Health & Household ) #25 in 9V Batteries #1,873 in Sales & Deals
Brand	Energizer
Built-In Media	Battery Pack
Compatible Phone Models	L522BP2
Customer Reviews	4.7 out of 5 stars 5,815 Reviews
Global Trade Identification Number	00039800911575
Item Dimensions	0.7 x 3.7 x 4.5 inches
Item Type Name	9v-batteries
Item Weight	0.06 Kilograms
Manufacturer	Energizer Batteries
Model Name	ENR L522BP2.H4 LITH 9V-2 EMOD
Model Number	30039800911576
Number of Batteries	2 Lithium Metal batteries required. (included)
Recommended Uses For Product	Camera
Reusability	Single Use
UPC	039800911575
Unit Count	2.0 Count
Voltage	9 Volts

Reviews

R**E

17.04.2026

R**.

23.03.2026

A**T

15.08.2020

S**A

18.01.2026

M**T

2.08.2020

S**G

7.04.2026

A**R

9.03.2026

R**R

3.03.2026

L**Y

24.12.2025

D**N

8.03.2026

B**K

3.12.2025

M**Y

23.01.2026

H**I

28.01.2026

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