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.

Energizer Ultimate Lithium 9v Batteries 1 Pack Lithium 9 Volt

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Description

⚡ Energize your essentials with power that never quits!

DECADE LONG BACKUP - Holds power for up to 10 years in storage, making it the ultimate choice for smoke detectors and emergency gear.
POWER THAT OUTLASTS - Lasts up to 20% longer in toys than standard alkaline batteries, keeping your devices energized and ready.
EXTREME TEMPERATURE READY - Reliable performance from freezing -40°F to scorching 140°F, perfect for any environment or season.
LEAK RESISTANT DURABILITY - Engineered with leak-resistant construction to protect your valuable devices and ensure safety.
LIGHTWEIGHT LONG LASTING - 25% lighter than alkaline batteries, reducing device weight without compromising power.

Energizer Ultimate Lithium 9V Battery delivers up to 20% longer life in toys, operates reliably in extreme temperatures (-40°F to 140°F), and features leak-resistant design. Weighing 25% less than alkaline batteries, it offers a 10-year shelf life, making it ideal for smoke detectors, toys, and critical devices requiring dependable, long-lasting power.

Specifications

ASIN	B018N7YZL6
Amperage	1 Amps
Antenna Location	Radio
Battery Capacity	9 Volts
Battery Cell Type	Lithium Metal
Battery Weight	250 Grams
Best Sellers Rank	5,771 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 611 in Disposable Household Batteries
Box Contents	Battery Pack
Brand Name	Energizer
Compatible Phone Models	smoke detectors, remote control cars, toys, games
Country of Origin	United Kingdom
Customer Reviews	4.7 4.7 out of 5 stars (2,273)
Global Trade Identification Number	00039800911568
Item Dimensions	32 x 13 x 19 millimetres
Item Type Name	9v-batteries
Item Weight	36 g
Manufacturer	Energizer
Model Name	ENR L522BP.H4 LITH 9V-1 EMOD
Model Number	L522BP
Number of Batteries	1 AAA batteries required. (included)
Reusability	Single Use
UPC	039800911568
Unit Count	1.0 Count
Voltage	9 Volts

Reviews

A**R

23.03.2026

J**D

9.01.2026

D**N

6.02.2023

C**A

11.08.2018

M**R

18.11.2025

C**M

7.04.2026

L**Y

12.08.2023

H**R

8.11.2025

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