expiredRed_Liz | Staff posted Feb 17, 2026 04:37 PM
Item 1 of 7
Item 1 of 7
expiredRed_Liz | Staff posted Feb 17, 2026 04:37 PM
HW 4-Pack 9V 1400mAh USB-C Rechargeable Lithium Batteries w/ Cable $12.45 + Free Shipping w/ Prime or $35+ Orders
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$33
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Absolutely no way these are 1400mAh. The bigger the lie, often the more disappointing the product.
USB charging puts extra electronic components and absolutely takes some capacity out.
Won't work well/properly in music type applications. The voltage converter makes interference.
I could only find ONE capacity review, 1*. 400mAh is what I would have guessed. It will probably lose 50-100mAh/year based on my experience with EBL 9v lithium rechargeable.
[[I put this battery on a constant 20 MA load to test its capacity. It is nowhere near the1000 MAH that is advertised. It shuts down completely after 20 hours. That amounts to 400 MAH, not 1000. Even considering the voltage is being boosted with a switching regulator from two 3.7V Lithium cells, it still falls far short of 1000. This is not surprising, given that there is simply not enough physical space in a 9V battery for that level of capacity. I've grown weary of Amazon allowing this kind of false advertising on its website.]]
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That was before I switched garage door openers and added to home assistant. Now I just really don't ever use the keypad.
Absolutely no way these are 1400mAh. The bigger the lie, often the more disappointing the product.
USB charging puts extra electronic components and absolutely takes some capacity out.
Won't work well/properly in music type applications. The voltage converter makes interference.
I could only find ONE capacity review, 1*. 400mAh is what I would have guessed. It will probably lose 50-100mAh/year based on my experience with EBL 9v lithium rechargeable.
[[I put this battery on a constant 20 MA load to test its capacity. It is nowhere near the1000 MAH that is advertised. It shuts down completely after 20 hours. That amounts to 400 MAH, not 1000. Even considering the voltage is being boosted with a switching regulator from two 3.7V Lithium cells, it still falls far short of 1000. This is not surprising, given that there is simply not enough physical space in a 9V battery for that level of capacity. I've grown weary of Amazon allowing this kind of false advertising on its website.]]
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Still using them to see how long they hold up. Reliability is an unknown. I suspect the marketing claims for cycle life is WAY off. It'll take years to figure that out. By then the field will have changed a lot I think.
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