Has anyone had a problem with them being a bit larger than a standard alkaline 9-volt battery? I read some brands are tight in smoke detectors

They are slightly larger than normal 9v batteries. If you have the battery terminals that snap onto the battery, you might be ok. I have the type of smoke alarm that you slide the battery into and it’s supposed to “mate itself”. Because of the size difference and the battery being really squishy (not rigid) they did not work for me- I had to return all 8.

Are these batteries made in China or where?

While my personal belief is that it is safe to assume they are made in China, there is nothing on the batteries or on the packaging that indicates the country of origin.

9v Battery | Desertcart French Polynesia

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Sold byAmazon French PolynesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power that outlasts your hustle — stay charged, stay secure.

VERSATILE POWERHOUSE - Perfect for smoke detectors, keyless entry, multimeters, metal detectors, and more—one battery to rule them all.
DECADE LONG RELIABILITY - Up to 10 years of backup power in critical smoke detectors and fire alarms—because safety can't wait.
EXTREME WEATHER WARRIOR - Smart protection ensures flawless operation from freezing cold to scorching heat (-20°C to 60°C).
FAST FLASH NO DOWNTIME - Ultra-short recycle time delivers instant, consistent power for high-drain devices like digital cameras.
DOUBLE THE POWER DOUBLE THE PEACE OF MIND - Lasts 2x longer than standard 600mAh lithium batteries for uninterrupted device performance.

Enegitech 9V Lithium Battery delivers a robust 1200mAh capacity with up to 10 years of shelf and backup life, outperforming standard lithium and alkaline batteries. Engineered with smart protection for extreme temperatures (-20°C to 60°C), it’s the go-to power source for smoke detectors, fire alarms, keyless entry locks, and high-drain electronics. This 4-pack ensures your essential devices stay reliably powered, combining longevity, versatility, and rapid performance in one sleek package.

Specifications

ASIN	B076MV1Z3P
Antenna Location	Carbon Monoxide Alarms, Garage Door Keypad, Guitar Pickup, Gun Gafe Keypad, Keyless Entry Door Lock, Moisture Meter, Multimeter, Smoke Detectors
Battery Capacity	1200 milliamp_hours
Battery Cell Type	Lithium Manganese Dioxide
Battery Weight	140 g
Best Sellers Rank	#162,624 in Health & Household ( See Top 100 in Health & Household ) #115 in 9V Batteries
Brand	Enegitech
Customer Reviews	4.6 4.6 out of 5 stars (573)
Included Components	Battery Pack
Item Type Name	9v, lithium, battery, 1200mah, non-rechargeable, li-ion, battery.
Item Weight	1 g
Manufacturer	Enegitech
Model Name	9V
Model Number	9V 1200mAh
Number of Batteries	4 Lithium Ion batteries required. (included)
Reusability	Single Use
UPC	611677932503
Unit Count	4 Count
Voltage	9 volts
Warranty Description	1 year manufacturer

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