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

⏳10-year shelf life

⚡20% longer life vs MAX

❄️🔥Works -40°F to 140°F

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Description

⚡ Power your life, no compromises.

POWER THAT OUTLASTS - Lasts up to 20% longer in toys than Energizer MAX batteries, so your devices keep going when others quit.
TRUSTED BY MILLIONS - With over 33,000 glowing reviews and a 4.7-star rating, Energizer Ultimate Lithium is the go-to for professionals who demand reliability.
EXTREME WEATHER READY - Reliable performance from -40°F to 140°F means your gadgets stay powered through every season and adventure.
LEAK RESISTANT DURABILITY - Built with leak-resistant construction to protect your devices and ensure safety over long-term use.
LIGHTWEIGHT LONG LASTING - Weighing just 1.28 ounces, these 9V lithium batteries store power for up to 10 years—perfect for emergency backups.

Energizer Ultimate Lithium 9V Batteries deliver superior longevity and reliability with 20% longer life than standard batteries, extreme temperature tolerance from -40°F to 140°F, and a 10-year shelf life. Designed with leak-resistant technology and lightweight lithium metal composition, these batteries are ideal for high-tech devices, toys, and emergency use, trusted by millions worldwide.

Specifications

Asin	B018N7YZL6
Batteries	1 AAA batteries required. (included)
Best Sellers Rank	#22 in 9V Batteries
Date First Available	November 2, 2015
Department	Unisex
Item Model Number	L522BP
Manufacturer	Energizer
Product Dimensions	1.25 x 0.5 x 0.75 inches; 1.28 ounces

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