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 alkaline

🕰️10-year shelf life

❄️🔥Works from -40°F to 140°F

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Description

⚡ Energize your essentials with unstoppable power and peace of mind!

TRUSTED FOR SAFETY - Preferred choice for smoke alarms and critical devices, ensuring peace of mind with every use.
POWER THAT OUTLASTS - Lasts up to 20% longer than standard alkaline batteries, keeping your devices running when it counts.
EXTREME TEMPERATURE READY - Reliable performance from freezing -40°F to scorching 140°F—perfect for any season or environment.
LEAK RESISTANT DURABILITY - Engineered with leak-resistant construction to protect your valuable devices from damage.
LIGHTWEIGHT LONG LASTING - 25% lighter than alkaline batteries and holds power for up to 10 years in storage—ideal for backup and emergency use.

The Energizer Ultimate Lithium 9V Batteries (2 Pack) deliver up to 20% longer life than alkaline batteries, operate reliably in extreme temperatures from -40°F to 140°F, and feature leak-resistant construction. Lightweight and boasting a 10-year shelf life, these batteries are perfect for smoke alarms, toys, and critical devices, ensuring long-lasting, dependable power when you need it most.

Specifications

Asin	B01684J7P0
Batteries	2 Lithium Metal batteries required. (included)
Date First Available	April 12, 2016
Is Discontinued By Manufacturer	No
Item Model Number	30039800911576
Manufacturer	Energizer Batteries
Product Dimensions	0.7 x 3.7 x 4.5 inches; 2.12 ounces

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 45.38

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

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