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24000mAh 80W AC Power Bank / Portable Laptop Charger $48.99

$48.99
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AC Outlet Portable Laptop Charger, Omars 88Wh/24000mAh 80W AC Power Bank with AC Plug External Battery Pack Laptop Power Bank Portable Power Supply Compatible with MacBook and Devices Under AC 80W.

Full specs are on the page and apparently compatible with MacBook's. Use the code KYP9OO2Y for the discounted price.

https://www.amazon.com/dp/B073P81Z9V?th=1
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Created 08-08-2019 at 11:05 AM by Butim
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5 Comments

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#2
Good price, but this thing is massive! Also I bet there's significant loss going from DC to AC to DC. Unless you really need an AC plug, I would think you'd be better off with one of the many smaller (and cheaper) 20000mah pack with a PD port, like this [amazon.com].
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Last edited by timp August 8, 2019 at 01:02 PM.
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#3
Interesting.
But this looks obsoleted without PD.
The PD version has the same price before the coupon code
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Last edited by cgigate August 9, 2019 at 07:05 AM.
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#4
Quote from timp
:
Good price, but this thing is massive! Also I bet there's significant loss going from DC to AC to DC. Unless you really need an AC plug, I would think you'd be better off with one of the many smaller (and cheaper) 20000mah pack with a PD port, like this [amazon.com].
DC to AC has little to lose.
The power bank needs to convert to AC ( switching power) and then to DC anyway
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Last edited by cgigate August 9, 2019 at 07:05 AM.
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Joined Jan 2010
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#5
Quote from cgigate
:
DC to AC has little to lose.
The power band needs to convert to AC ( switching power) and then to DC anyway
Right, I believe DC to AC is usually ~95% efficient, but most AC to DC power adapters (for laptops, cell phones, etc) are less than 85% efficient. Combined it seems like that's a good bit of power loss compared to a traditional battery pack where only a voltage step is needed.
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#6
Quote from timp
:
Good price, but this thing is massive! Also I bet there's significant loss going from DC to AC to DC. Unless you really need an AC plug, I would think you'd be better off with one of the many smaller (and cheaper) 20000mah pack with a PD port, like this [amazon.com].
I had that one, died after a couple of months and seller stopped responding for the warranty they claimed.
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