Customer Review

7 of 7 people found the following review helpful
3.0 out of 5 stars Don't work in my smoke detectors, October 6, 2012
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This review is from: Tenergy TN141 2 Bay 9V Smart Charger with 4 pcs Centura Low Self-discharge 9V NiMH Rechargeable Batteries (Electronics)
Seems like a solid product, other than the fact that the contact points don't protrude out as far as a regular 9v, meaning they're not suitable for 100% of 9v applications. My smoke detectors have a little spring door that pops open, you put the battery in, and close it, which creates the necessary contact...except with these. For all other 9v applications, they seem perfectly fine.
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Tracked by 2 customers

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Showing 1-4 of 4 posts in this discussion
Initial post: Nov 4, 2012 6:39:48 PM PST
Last edited by the author on Nov 4, 2012 7:43:59 PM PST
William Song says:
From what I've read, a device that needs power over a long period (i.e., smoke detector) is better off with a regular battery. I think the exception would be a lithium ion rechargeable, but check with a smoke detector expert on lithium ion.

Anyhow, in general, rechargeable batteries (i.e., NiMH) are better for devices that need power for a shorter period, such as a wireless mic, an electronic toy, etc. Why? Because NiMH rechargeable batteries discharge energy more rapidly versus normal batteries. They just won't last as long as regular batteries.

Besides that, when a NiMH rechargeable gets close to the end of its charge, it can drop its power rapidly. That's less warning time for a smoke detector.

So in a way, it's a blessing that the Tenergy batteries were a bit small for your smoke detector. Did you use them in a different device?

Also, did you contact Tenergy to ask why they're small? That makes me curious, too.

In reply to an earlier post on Nov 4, 2012 8:36:46 PM PST
I don't agree it's a blessing; in a low draw device like a smoke detector, I'd much rather re charge them a little more often, rather than ordering/going out and buying disposables.

The batteries are working fine in the two 9v devices I have (multimeter and temperature gun).

I have not contacted Tenergy, as I don't believe the issue is a manufacturing defect.

In reply to an earlier post on Nov 4, 2012 8:57:40 PM PST
William Song says:
Good point on the disposables. I did a little more digging online and read that the lithium ions do last longer than the NiMH rechargeables.

If you type "Tenergy 9V Li-ion Battery Charger" on Amazon, you'll find the lithium ion rechargeable batteries. One of the chargers said, "Primary applications:building alarms, monitoring and security systems, GPS, emergency transmitters, radio communication devices."

They didn't say smoke detectors, but my guess would be that it could be used for that since that's kind of like a building alarm. Anyhow, hope the Li-ion type of charger is what you're looking for.

Posted on Mar 13, 2014 12:29:01 PM PDT
ieee488 says:
Thank you for information.

I have eight smoke detectors which all use 9V batteries.
With two of them, the 9V is the only power source.
With the others, the 9V is backup.

I hate throwing about the disposables every year.

I have emailed Tenergy which charger to buy for the Li-Ion batteries.
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