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 9 Volt Battery

Product ID: 342662368

Details

Battery cell composition
Lithium Metal
Brand
Energizer
Number of batteries
1 AAA
Recommended uses for product
Smoke
Unit count
1 Count

⏳Longest-lasting disposable

⚡9V high voltage power

🔋Lithium metal cell tech

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Description

⚡ Energize your essentials with unstoppable power!

LIGHTWEIGHT COMPACT - Only 36g with sleek 32x13x19mm dimensions
POWER THAT LASTS ALL DAY - 9 volts of reliable energy for your critical devices
TRUSTED BY PROS GAMERS - Top choice for high-tech gadgets and gaming consoles
DEPENDABILITY WHEN IT COUNTS - Ideal for smoke detectors and emergency devices
CUTTING EDGE LITHIUM TECHNOLOGY - Advanced lithium metal cells for superior performance

The Energizer Ultimate Lithium 9 Volt Battery delivers unmatched longevity and consistent 9V power using advanced lithium metal technology. Lightweight and compact, it’s engineered for high-tech devices, smoke detectors, and gaming consoles, ensuring your critical gear never misses a beat.

Specifications

ASIN	B018N7YZL6
Amperage	1 Amps
Antenna Location	Smoke Detectors
Battery Cell Type	Lithium Metal
Best Sellers Rank	#110,507 in Electronics ( See Top 100 in Electronics ) #1,569 in Disposable Household Batteries
Brand	Energizer
Compatible Phone Models	battery powered toys, gaming consoles, high
Customer Reviews	4.7 4.7 out of 5 stars (2,364)
Global Trade Identification Number	00039800911568
Item Dimensions	32 x 13 x 19 millimeters
Item Weight	36 g
Manufacturer	Energizer Batteries- Consumables
Model Name	ENR L522BP.H4 LITH 9V-1 EMOD
Model Number	L522BP
Number of Batteries	1 AAA batteries required. (included)
Reusability	Single Use
UPC	039800911568
Unit Count	1 Count
Voltage	9 Volts

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€ 100.45

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