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.

EnergizerUltimate Lithium 9V Batteries (1 Pack), Lithium 9 Volt Batteries

EnergizerUltimate Lithium 9V Batteries (1 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.

4.6/5

Product ID: 316513149

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Details

Number of batteries
1 AAA
Brand
Energizer
Battery cell composition
Lithium Metal
Battery capacity
9 Volts
Recommended uses for product
Radio

⏳10-year shelf life backup

⚡Longest-lasting 9V power

❄️🔥Extreme temp performance -40°F to 140°F

Frequently Bought Together

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

Energizer AA Batteries, Ultimate Lithium Double A Battery, 24 Count

Energizer AA Batteries, Ultimate Lithium Double A Battery, 8 Count

Description

⚡ Power that never quits—stay charged, stay ahead!

READY WHEN YOU ARE - Holds power up to 10 years in storage—your ultimate backup energy source.
UNMATCHED LONGEVITY - Experience the longest-lasting 9V battery for your critical devices.
VERSATILE POWERHOUSE - Ideal for smart home gadgets, outdoor security, digital cameras, and handheld games.
LIGHTWEIGHT COMPACT - Slim design fits seamlessly into your devices without adding bulk.
ALL WEATHER RELIABILITY - Operates flawlessly from freezing cold to scorching heat, perfect for any environment.

The Energizer Ultimate Lithium 9V battery delivers industry-leading longevity and reliability, powering your essential devices with unmatched endurance. Designed to perform in extreme temperatures from -40°F to 140°F and maintain charge for up to 10 years in storage, it’s the go-to choice for professionals who demand dependable energy in any situation.

Specifications

Package Dimensions L x W x H	14.9 x 9 x 1.7 centimetres
Package Weight	0.04 Kilograms
Product Dimensions L x W x H	32 x 13 x 19 millimetres
Item Weight	0.08 Pounds
Brand	Energizer
Included components	Battery Pack
Part number	L522BP
Size	1 count
Style	1 Count
Guaranteed software updates until	unknown

Have a Question? See What Others Asked

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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?

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6.02.2023

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