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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⚡ Power that outlasts the rest—stay charged, stay ahead.

DECADE LONG BACKUP - Holds power for up to 10 years in storage—always ready when you need it most, especially for smoke detectors.
UNMATCHED LONGEVITY - Lasts up to 20% longer in toys than Energizer MAX—power through playtime without pause.
LIGHTWEIGHT COMPACT - 25% lighter than standard alkaline 9V batteries—easy to carry and install without bulk.
LEAK RESISTANT DURABILITY - Engineered to prevent leaks, protecting your valuable devices and ensuring safety.
EXTREME TEMPERATURE RESILIENCE - Reliable performance from -40°F to 140°F—your devices stay powered in any climate.

Energizer Ultimate Lithium 9V Batteries deliver 20% longer life in toys compared to Energizer MAX, operate reliably in extreme temperatures from -40°F to 140°F, and feature leak-resistant construction. Weighing 25% less than alkaline batteries, they hold power for up to 10 years in storage, making them ideal for toys, clocks, and critical devices like smoke detectors.

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Package Dimensions L x W x H	14.9 x 9 x 1.7 centimetres
Package Weight	0.04 Kilograms
Product Dimensions L x W x H	32 x 13 x 19 millimetres
Item Weight	36 g
Brand	Energizer
Included components	Battery Pack
Part number	L522BP
Size	1 count
Style	1 Count
Guaranteed software updates until	unknown

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

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