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 unstoppable power and reliability!

DECADE LONG BACKUP - Holds power for up to 10 years in storage—always ready when you need it most.
POWER THAT OUTLASTS - Lasts up to 20% longer in toys vs Energizer MAX for uninterrupted fun and work.
EXTREME WEATHER READY - Reliable performance from -40°F to 140°F keeps your devices running come rain, snow, or heatwave.
LEAK RESISTANT DURABILITY - Engineered with leak-resistant construction to protect your valuable devices over time.
LIGHTWEIGHT LONG LASTING - 25% lighter than alkaline batteries, reducing bulk without sacrificing power.

Energizer Ultimate Lithium 9V Battery delivers 20% longer life than standard alkaline batteries, performs flawlessly in extreme temperatures (-40°F to 140°F), and features leak-resistant construction. Lightweight and designed for long-term storage, it holds power for up to 10 years, making it the ideal choice for smoke detectors, toys, and critical devices.

Specifications

Amperage	1 Amps
Antenna Location	Radio
Asin	B018N7YZL6
Battery Capacity	9 Volts
Battery Cell Type	Lithium Metal
Battery Weight	250 Grams
Best Sellers Rank	8,637 in Electronics & Photo (See Top 100 in Electronics & Photo) 772 in Disposable Household Batteries
Brand Name	Energizer
Compatible Phone Models	smoke detectors, remote control cars, toys, games
Customer Reviews	4.7 4.7 out of 5 stars (2,356) 4.7 out of 5 stars
Global Trade Identification Number	00039800911568
Included Components	Battery Pack
Item Dimensions	32 x 13 x 19 millimetres
Item Type Name	9v-batteries
Item Weight	0.08 Pounds
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
Unit Count	1.0 count
Upc	039800911568
Voltage	9 Volts

Reviews

User

Good price

Light battery, good price, review say holds charge really well.

23.03.2026

User

Watch out for old stock...

I bought this for a smoke detector (backup power) - picking this based specifically on it's claimed long shelf life.... only to get one (in Dec 2025) that had a date of manufacture in 2023...

9.01.2026

User

A+

6.02.2023

User

Energía de verdad

La compré por sus características en cuanto a la alta resistencia a temperaturas tanto frío como para calor ... Espero también sea más durable que la batería Energizer Max que utilizo normalmente

11.08.2018

User

Mit Abstand die beste Batterie

Die Beste, nicht mehr und nicht weniger. Kein anderer 9volt Block hält so lange.

8.11.2025

User

Super bonne

Très bien

16.05.2026

User

Excelente

Todo muy bien, compre esta bateria porque dura mucho mas que las alcalinas y no tienen el inconveniente de que derraman liquido.

21.03.2019

User

Preiswert

18.11.2025

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Energizer Ultimate Lithium 9V Batteries (1 Pack), Lithium 9 Volt Batteries

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