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forum threadDesertGardener | Staff posted Aug 17, 2026 9:15 PM

4-Pack HW 9 Volt USB Rechargeable Lithium Batteries with USB C Cable $11.87 + Free Shipping w/ Prime

$12

$24

50% off
Amazon
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TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon [amazon.com] has 4-Pack HW 9 Volt USB Rechargeable Lithium Batteries with USB C Cable on sale for $21.58 - $9.71 off with code XK27AQBX at checkout = $11.87. Shipping is free w/ Prime or $35+ orders.
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TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon [amazon.com] has 4-Pack HW 9 Volt USB Rechargeable Lithium Batteries with USB C Cable on sale for $21.58 - $9.71 off with code XK27AQBX at checkout = $11.87. Shipping is free w/ Prime or $35+ orders.

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Aug 18, 2026 6:28 PM
488 Comments
Joined Mar 2016
harley48Aug 18, 2026 6:28 PM
488 Comments
From an Amazon capacity review:
[Of course it's not going to be 1400 mAH capacity at 9V, but 400? I cycled 2 batteries 3 times and capacity averaged around 400. The internal 3.7V lithium battery is likely what is rated for higher capacity, but even that is grossly inflated. Convenient to charge, but less capacity than a typical alkaline.]

No FW these will be 1400. Simply not enough room in the can.
Those exaggerations end up hurting the manufacturer, seller and customer. It would be better in the long run if there was some integrity.
Last edited by harley48 August 19, 2026 at 06:32 AM.
1
Today 5:59 AM
1.2K Comments
Joined Feb 2017
theshopper2022Today 5:59 AM
1.2K Comments
Quote from harley48 :
From an Amazon capacity review:
[Of course it's not going to be 1400 mAH capacity at 9V, but 400? I cycled 2 batteries 3 times and capacity averaged around 400. The internal 3.7V lithium battery is likely what is rated for higher capacity, but even that is grossly inflated. Convenient to charge, but less capacity than a typical alkaline.]

No FW these will be 1400. Simply not enough room in the can.
Those exaggerations end up hurting the manufacturer, seller and customer. It would be better in the long run if there was some integrity.
Do these work in smoke alarms, I have purchased 4 different brands and they all will drop voltage on warm days and the smoke alarm will give me the low battery chirp until the house cools down (no ac).

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