4-Pack HW 3600mWh Rechargeable 9 Volt Battery w/ Charger (Over 1000 charges / Quick Charging in 2.5 hours) $19.49 + Free Shipping w/ Prime or orders $35+

Sptx

Feb 16, 2026 11:57 PM

547 Posts

Joined Feb 2013

SptxFeb 16, 2026 11:57 PM

547 Posts

Pricing description is backwards Smilie

2

pnutz409

Feb 17, 2026 03:45 PM

30 Posts

Joined Feb 2006

pnutz409Feb 17, 2026 03:45 PM

30 Posts

No excuse for a beeping smoke detector now

wmblalock86

Feb 17, 2026 04:57 PM

256 Posts

Joined Aug 2008

wmblalock86Feb 17, 2026 04:57 PM

256 Posts

Our community has rated this post as helpful. If you agree, why not thank wmblalock86

A lot of reviews saying the batteries only charge to 8.25V... Most new 9V batteries start around 9.6V. These may not work for certain devices, and smoke detectors would likely start chirping really early, thinking the battery is almost dead.

3

rgreen1983

Feb 17, 2026 05:20 PM

276 Posts

Joined Oct 2012

rgreen1983Feb 17, 2026 05:20 PM

276 Posts

Our community has rated this post as helpful. If you agree, why not thank rgreen1983

3600mWh at 9v is 400mah, while the standard seems to be around 600mah in competing brands including EBL

1

4

harley48

Feb 22, 2026 04:51 PM

475 Posts

Joined Mar 2016

harley48Feb 22, 2026 04:51 PM

475 Posts

Quote from wmblalock86

:

A lot of reviews saying the batteries only charge to 8.25V... Most new 9V batteries start around 9.6V. These may not work for certain devices, and smoke detectors would likely start chirping really early, thinking the battery is almost dead.

Non-rechargeable 9v start out with higher voltage. It declines steadily as it's being used. At some point it will go below the 8.25v rechargeable which tends to hold steady due to voltage conversion/boost. I have not had a problem with smoke detectors on a 6 month charge cycle, and they work fine in other devices.
It's likely device specific but testing the voltage in beeping smoke detectors is generally around 7.5v.
YMMV depending on the particular device and it's current/voltage demands.
I have not personally tested them but based on the design and experience with other brands I suspect these will be ~400mAh or lower.

Another reminder - Voltage conversion makes electromagnetic interference. These PROBABLY WILL NOT WORK IN AUDIO DEVICES.

4-Pack HW 3600mWh Rechargeable 9 Volt Battery w/ Charger (Over 1000 charges / Quick Charging in 2.5 hours) $19.49 + Free Shipping w/ Prime or orders $35+

$19

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