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4-Pk HW 9V 1400mAh Rechargeable Lithium Batteries w/ USB-C Charging
$11
$24
54% off
Amazon
AmazonDeal Details
TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon has 4-Pack HW 9V 1400mAh Rechargeable Lithium Batteries w/ USB-C Charging on sale for $21.58 - $10.14 when you apply promo code IS0FMRKC at checkout = $11.44. Shipping is free w/ Prime or on $35+ orders.
Thanks to Staff Member Red_Liz for sharing this deal.
Note: This item is also available via S&S for the same price. You can manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to an extra 15% savings when you have 5 or more items in your current monthly subscription. You must be logged in to clip coupons and apply promo codes. If a code doesn't work, make sure you click the right arrow to apply the code.
Product Details:
Thanks to Staff Member Red_Liz for sharing this deal.
Note: This item is also available via S&S for the same price. You can manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to an extra 15% savings when you have 5 or more items in your current monthly subscription. You must be logged in to clip coupons and apply promo codes. If a code doesn't work, make sure you click the right arrow to apply the code.
Product Details:
- 1400mAh rechargeable 9V batteries
- Built-in USB-C charging port
- Includes 4-in-1 charging cable
- LED charging indicator
- Overcharge, over-temperature, overload, and short-circuit protection
- Up to 1,000 recharge cycles
- Low self-discharge and constant voltage output
- Compatible with smoke detectors, cameras, walkie-talkies, toys, game controllers, GPS units, clocks, security devices, and medical equipment
Editor's Notes
Written by Nate650 | Staff- About this deal:
- This offer is $0.55 less than this previous frontpage deal from April.
- About this store:
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Additional notes:
- Please see the original post for additional details & give the wiki and additional forum comments a read for helpful discussion.
Community Notes
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Deal Details
Community Notes
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TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon has 4-Pack HW 9V 1400mAh Rechargeable Lithium Batteries w/ USB-C Charging on sale for $21.58 - $10.14 when you apply promo code IS0FMRKC at checkout = $11.44. Shipping is free w/ Prime or on $35+ orders.
Thanks to Staff Member Red_Liz for sharing this deal.
Note: This item is also available via S&S for the same price. You can manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to an extra 15% savings when you have 5 or more items in your current monthly subscription. You must be logged in to clip coupons and apply promo codes. If a code doesn't work, make sure you click the right arrow to apply the code.
Product Details:
Thanks to Staff Member Red_Liz for sharing this deal.
Note: This item is also available via S&S for the same price. You can manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to an extra 15% savings when you have 5 or more items in your current monthly subscription. You must be logged in to clip coupons and apply promo codes. If a code doesn't work, make sure you click the right arrow to apply the code.
Product Details:
- 1400mAh rechargeable 9V batteries
- Built-in USB-C charging port
- Includes 4-in-1 charging cable
- LED charging indicator
- Overcharge, over-temperature, overload, and short-circuit protection
- Up to 1,000 recharge cycles
- Low self-discharge and constant voltage output
- Compatible with smoke detectors, cameras, walkie-talkies, toys, game controllers, GPS units, clocks, security devices, and medical equipment
Editor's Notes
Written by Nate650 | Staff- About this deal:
- This offer is $0.55 less than this previous frontpage deal from April.
- About this store:
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Additional notes:
- Please see the original post for additional details & give the wiki and additional forum comments a read for helpful discussion.
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31 Comments
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9V are primarily used in low current draw applications. Example: smoke alarm. Where the battery is expected to last 5-10 years!!!! But rechargeable batteries generally have a hard time with self-discharge and will decline in 1-2 years.
Just put in an alkaline battery for a 10 year application.
Unless you've got some special device that uses a 9V but needs to have the battery changed every month, there is just no point in a rechargeable 9v
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9V are primarily used in low current draw applications. Example: smoke alarm. Where the battery is expected to last 5-10 years!!!! But rechargeable batteries generally have a hard time with self-discharge and will decline in 1-2 years.
Just put in an alkaline battery for a 10 year application.
Unless you've got some special device that uses a 9V but needs to have the battery changed every month, there is just no point in a rechargeable 9v
9V are primarily used in low current draw applications. Example: smoke alarm. Where the battery is expected to last 5-10 years!!!! But rechargeable batteries generally have a hard time with self-discharge and will decline in 1-2 years.
Just put in an alkaline battery for a 10 year application.
Unless you've got some special device that uses a 9V but needs to have the battery changed every month, there is just no point in a rechargeable 9v
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9V are primarily used in low current draw applications. Example: smoke alarm. Where the battery is expected to last 5-10 years!
...
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However, you're right to notice that rechargeable 9V batteries—especially lithium types like these—often measure under 8.5V when fully charged, which is normal for this chemistry. Here's why:
- Lithium polymer cells (used in these batteries) have a nominal voltage lower than alkaline 9V batteries
- Fully charged lithium 9V batteries typically read around 8.4-8.7V on a multimeter, while alkaline alkalines can reach closer to 9.6V
- Despite the lower actual voltage, they maintain stable power output and work in most 9V devices designed with some voltage tolerance
Important: Some devices—particularly smoke detectors, medical equipment, or safety-critical gear—may require a true 9V+ reading. If your applications need that higher voltage, alkaline 9V batteries would be more reliable.Customers do report these work well for intermittent-use devices like smoke detectors, but the lower actual voltage is a trade-off of the rechargeable lithium technology
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- Lithium polymer cells (used in these batteries) have a nominal voltage lower than alkaline 9V batteries
- Fully charged lithium 9V batteries typically read around 8.4-8.7V on a multimeter, while alkaline alkalines can reach closer to 9.6V
- Despite the lower actual voltage, they maintain stable power output and work in most 9V devices designed with some voltage tolerance
Important: Some devices—particularly smoke detectors, medical equipment, or safety-critical gear—may require a true 9V+ reading. If your applications need that higher voltage, alkaline 9V batteries would be more reliable.Customers do report these work well for intermittent-use devices like smoke detectors, but the lower actual voltage is a trade-off of the rechargeable lithium technologyThat said, I do use similar lithium rechargeable 9V batteries in my smoke detectors and they by far outlast alkalines. Best of all, keep at least an extra in waiting and you'll always have one to replace a beeping one with.
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