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

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. MAX

🕰️10 years shelf life

❄️🔥Works -40°F to 140°F

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Description

⚡ Power that keeps pace with your hustle — anytime, anywhere.

LIGHTWEIGHT POWER - 25% lighter than alkaline batteries for easy handling and portability.
UNMATCHED LONGEVITY - Outlasts standard batteries by 20%, keeping your devices powered longer.
DECADE LONG SHELF LIFE - Stores up to 10 years, ready whenever you need backup power.
LEAK RESISTANT DURABILITY - Engineered to prevent leaks, protecting your valuable devices.
EXTREME TEMPERATURE RESILIENCE - Reliable performance from freezing cold to scorching heat (-40°F to 140°F).

Energizer Ultimate Lithium 9V Batteries deliver 20% longer life than Energizer MAX, operate reliably in extreme temperatures from -40°F to 140°F, and feature leak-resistant construction. These lightweight batteries weigh 25% less than alkaline and can hold power for up to 10 years in storage, making them the ultimate choice for professional-grade, long-lasting energy.

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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€ 45.38

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