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 Battery

Product ID: 733804853

Details

Number of Batteries
1 AAA
Brand
Energizer
Battery Cell Composition
Lithium
Battery Capacity
9 Volts
Recommended Uses For Product
Remote Control

⚡20% longer life vs Energizer MAX

🔋10-year shelf life, leak-proof

❄️🔥Operates from -40°F to 140°F

RM349

Duties & taxes included

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Description

⚡ Energize your essentials with unstoppable power!

LEAK PROOF SAFETY - Protects your valuable devices with a durable, leak-resistant design that prevents corrosion and damage.
POWER THAT OUTLASTS - Lasts up to 20% longer than standard alkaline batteries, keeping your devices energized when it matters most.
VERSATILE ESSENTIAL - Ideal for smoke detectors, toys, remote controls, and watches—powering your everyday essentials with confidence.
EXTREME WEATHER READY - Performs flawlessly in harsh conditions from freezing cold to scorching heat, ensuring reliability year-round.
LIGHTWEIGHT LONG LASTING - Weighing just 36 grams, this 9V lithium battery stores power for up to 10 years, ready whenever you need it.

The Energizer Ultimate Lithium 9V Battery delivers 20% longer life than Energizer MAX, operates reliably in extreme temperatures from -40°F to 140°F, and features a leak-proof design for device protection. Lightweight and with a 10-year shelf life, it’s the go-to power source for smoke detectors, toys, and remote controls.

Specifications

ASIN	B018N7YZL6
Amperage	1 Amps
Antenna Location	Remote Control Vehicle
Battery Capacity	9 Volts
Battery Cell Composition	Lithium
Battery Cell Type	Lithium
Battery Weight	250 Grams
Brand	Energizer
Compatible Phone Models	smoke detector, remote control car, toy, game
Customer Reviews	4.7 out of 5 stars 2,288 Your Review
Global Trade Identification Number	00039800911568
Item Dimensions	32 x 13 x 19 mm
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)
Recommended Uses For Product	Remote Control Vehicle
Reusability	Rechargeable
UPC	039800911568
Unit Count	1.0 Count
Voltage	9 Volts

Reviews

C**A

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

A**R

Good price

23.03.2026

M**R

Preiswert

18.11.2025

C**M

Great price and factory fresh!

7.04.2026

L**Y

Best money can buy for guitar pups

12.08.2023

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