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expiredRed_Liz | Staff posted Mar 20, 2026 06:57 PM
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expiredRed_Liz | Staff posted Mar 20, 2026 06:57 PM

Prime Members: 4-Pack HW 9 Volt 1400mAh Rechargeable Lithium Batteries

+ Free S&H

$13

$33

60% off
Amazon
30 Comments 11,627 Views
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Deal Details
TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon has for Prime Members: 4-Pack HW 9 Volt 1400mAh Rechargeable Lithium Batteries on sale for $19.99 - 35% with promo code 38PSK6NZ at checkout = $12.99. Shipping is free.

Thanks to Staff Member Red_Liz for sharing this deal.
  • Note: You must be logged in to clip coupons or apply promo codes. Coupons/Promo codes are typically single-use, may vary by account or may need to be re-applied in order to discount properly.
Details:
  • Capacity & Runtime: Upgraded 1400mAh rechargeable 9V lithium batteries; longer runtime than standard alkaline, NiMH, or regular lithium batteries; consistent, reliable power output
  • Charging: Built-in USB-C port; includes 4-in-1 charging cable; no separate charger required; LED indicator displays charging status
  • Safety Features: Multiple protections against overcharge, over-temperature, overload, and short-circuit
  • Eco & Cost Benefits: Up to 1000 recharge cycles; low self-discharge; constant voltage output; reduces waste and long-term costs
  • Compatibility: Suitable for smoke detectors, fire alarms, digital cameras, walkie-talkies, toys, game controllers, GPS units, clocks, security devices, and medical equipment

Editor's Notes

Written by SaltyOne | Staff

Original Post

Written by Red_Liz | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon has for Prime Members: 4-Pack HW 9 Volt 1400mAh Rechargeable Lithium Batteries on sale for $19.99 - 35% with promo code 38PSK6NZ at checkout = $12.99. Shipping is free.

Thanks to Staff Member Red_Liz for sharing this deal.
  • Note: You must be logged in to clip coupons or apply promo codes. Coupons/Promo codes are typically single-use, may vary by account or may need to be re-applied in order to discount properly.
Details:
  • Capacity & Runtime: Upgraded 1400mAh rechargeable 9V lithium batteries; longer runtime than standard alkaline, NiMH, or regular lithium batteries; consistent, reliable power output
  • Charging: Built-in USB-C port; includes 4-in-1 charging cable; no separate charger required; LED indicator displays charging status
  • Safety Features: Multiple protections against overcharge, over-temperature, overload, and short-circuit
  • Eco & Cost Benefits: Up to 1000 recharge cycles; low self-discharge; constant voltage output; reduces waste and long-term costs
  • Compatibility: Suitable for smoke detectors, fire alarms, digital cameras, walkie-talkies, toys, game controllers, GPS units, clocks, security devices, and medical equipment

Editor's Notes

Written by SaltyOne | Staff

Original Post

Written by Red_Liz | Staff

Community Voting

Deal Score
+34
Good Deal
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Top Comments

dantheman9703
2286 Posts
1068 Reputation
Definitely don't recommend with low quality lithium cells. There's always chance they randomly drain too quickly to output the amps required for the alarm to recognize a low battery to warn you. Better off with dollar store 2 for $1.25

30 Comments

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Mar 21, 2026 04:15 AM
894 Posts
Joined Oct 2020
jcnixMar 21, 2026 04:15 AM
894 Posts
Quote from Ride_The_Sky :
Can you even change batteries in new ones. They are now sealed and they pretty much expire in 10 years, really weird thst this is new trend, a lot of plastic waste, a lot of malfunction. I had to get warranty replacement and they are not cheap. Smoke and Carbon Monoxide detectors are expensive.. They said maybe I didn't clean it enough regularly that's why it malfunctioned... didn't clean it enough.. what?
I'm 0 for 4 getting 10 years out of a sealed smoke alarm. Lasted 3-7 years, before they all ended up beeping for low battery, and it's a pain to flip the little slide switch to shut them off.
Pro
Mar 21, 2026 08:35 AM
1,256 Posts
Joined Jun 2013
abstractedpudding
Pro
Mar 21, 2026 08:35 AM
1,256 Posts
I wonder how these would be in a TENS unit.
Mar 21, 2026 01:20 PM
145 Posts
Joined Jun 2017
AchmedMar 21, 2026 01:20 PM
145 Posts
The promotional code you entered cannot be applied to your purchase.
Mar 21, 2026 01:22 PM
145 Posts
Joined Jun 2017
AchmedMar 21, 2026 01:22 PM
145 Posts
Quote from tooslick :
Code does work with S&S. Before tax about $12
This was my result: "The promotional code you entered cannot be applied to your purchase."
Mar 21, 2026 01:42 PM
228 Posts
Joined Jun 2025
informed-consumerMar 21, 2026 01:42 PM
228 Posts
Quote from Ride_The_Sky :
Can you even change batteries in new ones. They are now sealed and they pretty much expire in 10 years, really weird thst this is new trend, a lot of plastic waste, a lot of malfunction. I had to get warranty replacement and they are not cheap. Smoke and Carbon Monoxide detectors are expensive.. They said maybe I didn't clean it enough regularly that's why it malfunctioned... didn't clean it enough.. what?
in some communities you can get free detectors from your fire department.

- "Chuck Norris didn't die ... he transcended life" - Mike Proskey
3
Mar 21, 2026 01:44 PM
4,106 Posts
Joined Oct 2015
pyroskater85Mar 21, 2026 01:44 PM
4,106 Posts
Quote from Basecall :
Never even knew something like this existed. Nice post
I know right, but also ... it's about time.
Mar 21, 2026 01:53 PM
2,648 Posts
Joined Nov 2006
likeawMar 21, 2026 01:53 PM
2,648 Posts
I just tried the code and it still worked for me.

I purchased these batteries the last time they were on sale. One good thing about the battery is they actually measure 9 volts.Mine measured 8.97, 9.00 and 9.05..the other one was in the meter. I would not use these in a smoke detector as they will probably just go to zero volts when they get low. (not tested this)

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Mar 21, 2026 04:01 PM
4,253 Posts
Joined Jan 2012
RedElmoMar 21, 2026 04:01 PM
4,253 Posts
I can't think of a use for them. But I want them lol
Mar 21, 2026 04:38 PM
380 Posts
Joined Oct 2017
JasonR9389Mar 21, 2026 04:38 PM
380 Posts
Quote from Ride_The_Sky :
Can you even change batteries in new ones. They are now sealed and they pretty much expire in 10 years, really weird thst this is new trend, a lot of plastic waste, a lot of malfunction. I had to get warranty replacement and they are not cheap. Smoke and Carbon Monoxide detectors are expensive.. They said maybe I didn't clean it enough regularly that's why it malfunctioned... didn't clean it enough.. what?
They have a life span of 10 years max, after that they aren't reliable. Take a chance and cheat death for under $100?
Mar 21, 2026 04:57 PM
4,253 Posts
Joined Jan 2012
RedElmoMar 21, 2026 04:57 PM
4,253 Posts
Quote from JasonR9389 :
They have a life span of 10 years max, after that they aren't reliable. Take a chance and cheat death for under $100?
LoL so dramatic. "cheat death"

The chances are sooooo small. Car crash is higher.

First. You have to have a fire. (Small chance)
You have to be home.
You would have to be asleep and not smell it at all.
It got so big you can't escape.

I can keep going.
1
2
Mar 21, 2026 09:59 PM
3,439 Posts
Joined May 2004
Deal HoundMar 21, 2026 09:59 PM
3,439 Posts
Quote from mcdz71 :
any use these in smoke alarms?
I bought a four-pack of similar rechargeable 9V batteries of a different brand a few years ago. I don't use 9V batteries often and usually just need one from time to time in an infrequently used gadget that is stored without batteries installed. I fully charge them whenever I use one (a few times a year), and one or two of them is usually dead the next time get one to use. I won't use them for anything where reliability is important.
Mar 22, 2026 12:16 AM
492 Posts
Joined Jan 2009
tooslickMar 22, 2026 12:16 AM
492 Posts
Quote from Achmed :
This was my result: "The promotional code you entered cannot be applied to your purchase."
Hmm, worked for me but I purchased right after the post
Mar 22, 2026 05:05 AM
668 Posts
Joined Dec 2010
kittieloverMar 22, 2026 05:05 AM
668 Posts
Quote from Basecall :
Never even knew something like this existed. Nice post
Me either -
Mar 22, 2026 07:38 PM
150 Posts
Joined Oct 2017
bent622Mar 22, 2026 07:38 PM
150 Posts
Quote from tooslick :
Hmm, worked for me but I purchased right after the post
Same here. For me it was: The promotional code you entered is not valid.

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Mar 22, 2026 10:03 PM
237 Posts
Joined Dec 2024
LovelyGoat9932Mar 22, 2026 10:03 PM
237 Posts
There is ZERO possibility of building a 9 volt battery in the standard form factor of 9 volt batteries that has 1400mAh capacity. ZERO.

The container is just too small unless there's a tiny nuclear fuel source inside it. And then you would have all sorts of insurmountable other problems.

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