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Red_Liz | Staff 10.9K Views
Aug 26, 2026 12:54 PM

4-Pk HW 3600mWh Rechargeable 9V Batteries w/ 4-Slot Charger

$14

$26

46% off
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TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon has 4-Pack HW 3600mWh Rechargeable 9V Batteries w/ 4-Slot Charger (TH-ICP936) on sale for $23.38 - $9.12 (39%) off when you apply promo code E916HNF9 on the checkout page = $14.26. Shipping is free w/ Prime or on $35+ orders.

Thanks to Staff Member Red_Liz for sharing this deal.

About this product:
  • Square Li-ion rechargeable batteries with built-in safety protection against overcharging and leakage
  • Quick charging capability refills four units in approximately 2.5 hours using included charger
  • Each battery supports over 1000 charge cycles for long-term reusable power supply needs
  • Charger handles Li-ion Ni-MH and Ni-Cd types with compact square form factor design

Editor's Notes

Written by jimmytx | Staff
  • About this Store:
  • Additional Information:
    • Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

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 4-Pack HW 3600mWh Rechargeable 9V Batteries w/ 4-Slot Charger (TH-ICP936) on sale for $23.38 - $9.12 (39%) off when you apply promo code E916HNF9 on the checkout page = $14.26. Shipping is free w/ Prime or on $35+ orders.

Thanks to Staff Member Red_Liz for sharing this deal.

About this product:
  • Square Li-ion rechargeable batteries with built-in safety protection against overcharging and leakage
  • Quick charging capability refills four units in approximately 2.5 hours using included charger
  • Each battery supports over 1000 charge cycles for long-term reusable power supply needs
  • Charger handles Li-ion Ni-MH and Ni-Cd types with compact square form factor design

Editor's Notes

Written by jimmytx | Staff
  • About this Store:
  • Additional Information:
    • Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

Original Post

Written by Red_Liz | Staff

Community Voting

Deal Score
+30
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Top Comments

harley48
505Comments
126Reputation
If you NEED 9v, they are 8.2 (likely) to max 8.4v fully charged. That is the nature of lithium chemistry.
The 3600mWh is COMPLETE, ATROCIOUS MARKETING LIES! I mean there is 'padding the truth, but that is WAY out of line.
HW does this with ALL their batteries, but this is the worst I've seen.
Capacity test show these to be ~400mAh = ~600mWh.
No way they will go 1000+ cycles. Doubt they would go 500. Maybe 100. But probably ALL the products in this category have grossly over inflated specs.
Go to Comment
The_4th_Doctor
61Comments
18Reputation
This only puts out 8.2 to 8.4V fully charged according to customer reviews so caution if you device or use alerts or requires 9V or slightly above that to function properly.
Go to Comment

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29 Comments

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Aug 26, 2026 5:53 PM
25 Comments
Joined Oct 2023
NeatTable721Aug 26, 2026 5:53 PM
25 Comments
It never occurred to me that 9 volt batteries could be rechargeable
1
1
Aug 26, 2026 6:00 PM
207 Comments
Joined Dec 2007
drewcpAug 26, 2026 6:00 PM
207 Comments

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Quote from NeatTable721 View quoted comment :
It never occurred to me that 9 volt batteries could be rechargeable
In the early days of consumer accessible rechargeable batteries (90s? '80s?) there were really awful 9Vs. As I recall they were significantly worse, in comparison, to the effectiveness of the AAA and AA batteries of that era. And they have to have a different style charger, where AA and AAA can usually share the same charger. I don't remember them being particularly popular.
1
Aug 26, 2026 6:46 PM
3 Comments
Joined Oct 2021
LovelyPartner8307Aug 26, 2026 6:46 PM
3 Comments
Quote from NeatTable721 View quoted comment :
It never occurred to me that 9 volt batteries could be rechargeable
They make 9v with usb port charging. I use those because I tend to misplace these specialized chargers.
Aug 26, 2026 6:48 PM
61 Comments
Joined Aug 2026
The_4th_DoctorAug 26, 2026 6:48 PM
61 Comments

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This only puts out 8.2 to 8.4V fully charged according to customer reviews so caution if you device or use alerts or requires 9V or slightly above that to function properly.
6
Aug 26, 2026 6:56 PM
505 Comments
Joined Mar 2016
harley48Aug 26, 2026 6:56 PM
505 Comments

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

If you NEED 9v, they are 8.2 (likely) to max 8.4v fully charged. That is the nature of lithium chemistry.
The 3600mWh is COMPLETE, ATROCIOUS MARKETING LIES! I mean there is 'padding the truth, but that is WAY out of line.
HW does this with ALL their batteries, but this is the worst I've seen.
Capacity test show these to be ~400mAh = ~600mWh.
No way they will go 1000+ cycles. Doubt they would go 500. Maybe 100. But probably ALL the products in this category have grossly over inflated specs.
Last edited by harley48 August 26, 2026 at 01:09 PM.
10
2
Aug 26, 2026 8:43 PM
955 Comments
Joined Nov 2010
BobbyFinstockAug 26, 2026 8:43 PM
955 Comments
these good enough for a Fluke multimeter?
Aug 26, 2026 9:51 PM
2.7K Comments
Joined Nov 2006
likeawAug 26, 2026 9:51 PM
2.7K Comments
Quote from BobbyFinstock View quoted comment :
these good enough for a Fluke multimeter?
Yes, my Fluke is good to around 7 volts. Don't know about yours.

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Aug 26, 2026 11:39 PM
148 Comments
Joined Aug 2009
DigitalSteveAug 26, 2026 11:39 PM
148 Comments
Quote from NeatTable721 View quoted comment :
It never occurred to me that 9 volt batteries could be rechargeable
they are actually 8.2v
1
Aug 27, 2026 12:44 AM
3.7K Comments
Joined Dec 2008
Spider210Aug 27, 2026 12:44 AM
3.7K Comments
Never use these in Smoke Detectors if you value you and your family's life.
1
Aug 27, 2026 1:46 AM
212 Comments
Joined Dec 2018
imdjayAug 27, 2026 1:46 AM
212 Comments
I researched 9v rechargeables recently. 1: get NIMH not lithium ion if you actually want 9v and not 8.x, second, don't buy this brand, either they are deliberately vastly overstating the capacity, or some yutz added a zero by accident
1
1
Aug 27, 2026 3:55 AM
1.2K Comments
Joined Feb 2017
theshopper2022Aug 27, 2026 3:55 AM
1.2K Comments

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Quote from Spider210 View quoted comment :
Never use these in Smoke Detectors if you value you and your family's life.
I have been using rechargeable 9 volts in my smoke alarms for a long time. My smoke alarms and are mains powered. Battery is backup. It will chirp if there is low voltage or no battery in the smoke alarm. twice a year when I have to change the time, i put freshly charged batteries in.

If you only have battery powered smoke alarms, you need to be diligent about checking the smoke alarms are working. Rechargeables not a good idea in these cases.
Last edited by theshopper2022 August 26, 2026 at 09:00 PM.
3
Aug 27, 2026 4:18 AM
1.6K Comments
Joined Oct 2016
LaughinGassAug 27, 2026 4:18 AM
1.6K Comments
Quote from harley48 View quoted comment :
If you NEED 9v, they are 8.2 (likely) to max 8.4v fully charged. That is the nature of lithium chemistry.
The 3600mWh is COMPLETE, ATROCIOUS MARKETING LIES! I mean there is 'padding the truth, but that is WAY out of line.
HW does this with ALL their batteries, but this is the worst I've seen.
Capacity test show these to be ~400mAh = ~600mWh.
No way they will go 1000+ cycles. Doubt they would go 500. Maybe 100. But probably ALL the products in this category have grossly over inflated specs.
So...9v x 400mAh = 3600mWh...or am I missing something? Granted, you say it's more like 8.2v....so 8.2v x 400 mAh = 3280mWh, assuming it maintains that voltage output....
Aug 27, 2026 5:07 AM
2.4K Comments
Joined Oct 2011
MWinkAug 27, 2026 5:07 AM
2.4K Comments
Quote from drewcp View quoted comment :
In the early days of consumer accessible rechargeable batteries (90s? '80s?) there were really awful 9Vs. As I recall they were significantly worse, in comparison, to the effectiveness of the AAA and AA batteries of that era. And they have to have a different style charger, where AA and AAA can usually share the same charger. I don't remember them being particularly popular.
They were worse because they were only 7.2V. When NiMH became popular, some companies made 8.4V versions. Back in the old days, many chargers did support 9Vs. Even my very first NiCd charger supported AAA-D and 9Vs. It wasn't really until the NiMH era that AA/AAA-only chargers became common.
Aug 27, 2026 5:47 AM
340 Comments
Joined Oct 2025
SiennaAlpaca1565Aug 27, 2026 5:47 AM
340 Comments
Quote from BobbyFinstock View quoted comment :
these good enough for a Fluke multimeter?
Rechargeable 9v works in mine.

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Pro
Aug 27, 2026 7:08 AM
4.8K Comments
Joined Jan 2009
taiwan
Pro
Aug 27, 2026 7:08 AM
4.8K Comments
Quote from harley48 View quoted comment :
If you NEED 9v, they are 8.2 (likely) to max 8.4v fully charged. That is the nature of lithium chemistry.
The 3600mWh is COMPLETE, ATROCIOUS MARKETING LIES! I mean there is 'padding the truth, but that is WAY out of line.
HW does this with ALL their batteries, but this is the worst I've seen.
Capacity test show these to be ~400mAh = ~600mWh.
No way they will go 1000+ cycles. Doubt they would go 500. Maybe 100. But probably ALL the products in this category have grossly over inflated specs.
Had Li-on rechargeables from different brand and it only lasted couple of charges before they went completely dead. I don't have any confidence in these.

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