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expiredLovelyCheetah | Staff posted Nov 19, 2025 03:05 AM
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expiredLovelyCheetah | Staff posted Nov 19, 2025 03:05 AM

4 Pack HW USB C Rechargeable 9V Lithium Batteries 400mAh $9.74 + Free Shipping w/Prime or $35+

$9.74

$20

51% off
Amazon
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Tiger Head Hi Watt Battery HK Co LTD via Amazon [amazon.com] has 4 Pack HW USB C Rechargeable 9V Lithium Batteries 400mAh for $14.99 - $5.25 w/code O42SOKB6 = $9.74. Shipping is Free w/Prime or $35+
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Tiger Head Hi Watt Battery HK Co LTD via Amazon [amazon.com] has 4 Pack HW USB C Rechargeable 9V Lithium Batteries 400mAh for $14.99 - $5.25 w/code O42SOKB6 = $9.74. Shipping is Free w/Prime or $35+

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Nov 19, 2025 05:59 AM
753 Posts
Joined Nov 2023
IdahoRoamingGnomeNov 19, 2025 05:59 AM
753 Posts
Anyone that bought these last time do a capacity test on them?
1
Nov 19, 2025 06:10 AM
9,632 Posts
Joined Nov 2013
AdelleyNov 19, 2025 06:10 AM
9,632 Posts
Are these good for smoke detectors?
1
Nov 19, 2025 06:23 AM
131 Posts
Joined Oct 2007
sscamaroNov 19, 2025 06:23 AM
131 Posts
Quote from Adelley :
Are these good for smoke detectors?
I frequently consider these, but most detector manufactures don't recommend them due to their higher discharge rate and steep end-of-charge drop which presents safety risks
2
Nov 19, 2025 06:34 AM
1,286 Posts
Joined Nov 2012
i_max2k2Nov 19, 2025 06:34 AM
1,286 Posts
Quote from IdahoRoamingGnome :
Anyone that bought these last time do a capacity test on them?
I tried this AA version and it didn't last long.
Nov 19, 2025 06:45 AM
753 Posts
Joined Nov 2023
IdahoRoamingGnomeNov 19, 2025 06:45 AM
753 Posts
Quote from i_max2k2 :
I tried this AA version and it didn't last long.
Lithium AA with USB C port, or own charger?
Nov 19, 2025 06:46 AM
753 Posts
Joined Nov 2023
IdahoRoamingGnomeNov 19, 2025 06:46 AM
753 Posts
Quote from sscamaro :
I frequently consider these, but most detector manufactures don't recommend them due to their higher discharge rate and steep end-of-charge drop which presents safety risks
They'd be fine for hardwired smoke detectors.
Nov 19, 2025 08:23 AM
28 Posts
Joined Jan 2016

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Nov 19, 2025 08:41 AM
112 Posts
Joined May 2010
bankofthedankNov 19, 2025 08:41 AM
112 Posts
Quote from fatboylou :
Hardwired smoke detectors, use external power. 😒
They also have battery backups
Nov 19, 2025 09:29 AM
753 Posts
Joined Nov 2023
IdahoRoamingGnomeNov 19, 2025 09:29 AM
753 Posts
Quote from fatboylou :
Hardwired smoke detectors, use external power. 😒
No shit, they're hardwired.
3
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