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 (1 Pack), Lithium 9 Volt Batteries

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

Product ID: 21698714

Details

Battery Capacity
9 volts
Battery Cell Composition
Lithium Metal
Brand
Energizer
Number of Batteries
1 AAA
Recommended Uses For Product
Radio

⚡20% longer life vs. MAX

🛡️Leak-resistant & durable

❄️🔥Works -40°F to 140°F

€ 18.10

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Energize your essentials with unstoppable power!

POWER THAT OUTLASTS - Lasts up to 20% longer in toys than standard batteries—stay ahead of the pack.
EXTREME WEATHER READY - Reliable performance from -40°F to 140°F—your devices never miss a beat, rain or shine.
LEAK RESISTANT DURABILITY - Engineered to resist leaks, protecting your valuable devices and ensuring longevity.
VERSATILE HIGH TECH POWER - Perfect for cameras, smart home devices, and flashlights—power your lifestyle with confidence.
LIGHTWEIGHT LONG LASTING - Weighing just 1.28 ounces, these 9V batteries store power for up to 10 years—always ready when you are.

Energizer Ultimate Lithium 9V Batteries deliver 20% longer life than Energizer MAX, operate reliably in extreme temperatures (-40°F to 140°F), and feature leak-resistant construction. Lightweight and designed for long-term storage up to 10 years, these batteries are ideal for high-tech devices, toys, and emergency backups.

Specifications

ASIN	B018N7YZL6
Amperage	1 A
Antenna Location	Radio
Battery Capacity	9 volts
Battery Cell Composition	Lithium Metal
Battery Cell Type	Lithium Metal
Battery Weight	250 g
Best Sellers Rank	#1,496 in Health & Household ( See Top 100 in Health & Household ) #19 in 9V Batteries
Brand	Energizer
Compatible Phone Models	smoke detectors, remote control cars, toys, games
Customer Reviews	4.7 out of 5 stars 33,741 Reviews
Global Trade Identification Number	00039800911568
Included Components	Battery Pack
Item Dimensions	1.25 x 0.5 x 0.75 inches
Item Type Name	9v-batteries
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	Radio
Reusability	Single Use
UPC	039800911568
Unit Count	1 Count
Voltage	9 volts
Warranty Description	No Warranty

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