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Izzy138 | Staff 1.2K Views
Sep 7, 2026 2:10 PM

12 Pack HW 9 Volt Rechargeable Batteries, USB-C Lithium $32.40 + Free Shipping w/Prime or $35+

$32

$57

43% off
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Tiger Head Hiwatt Battery HK CO via Amazon [amazon.com] has a 12 Pack of HW 9 Volt Rechargeable Batteries 12 Pack, USB-C Lithium for $32.40 w/code 9PJ32F8G . Shipping is Free w/Prime or $35+
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Tiger Head Hiwatt Battery HK CO via Amazon [amazon.com] has a 12 Pack of HW 9 Volt Rechargeable Batteries 12 Pack, USB-C Lithium for $32.40 w/code 9PJ32F8G . Shipping is Free w/Prime or $35+

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Today 10:45 PM
148 Comments
Joined Aug 2009
stilwebmToday 10:45 PM
148 Comments
Do not use rechargeable batteries in smoke detectors despite the compatibility claim on the product page. Instead of a slow voltage decline, they drop suddenly, so you may never get a low battery warning, or if you do, it's too late for the alarm to work.

Also it looks like the batteries are the size of a soda can in the AI pic.

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