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forum threadwordage posted Yesterday 09:01 PM
forum threadwordage posted Yesterday 09:01 PM

Power Bank 27,000mAh with PD 140-Watt and Intelligent Digital TFT Display (Black)--FS to store $32.31

$32

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So I was surfing the other day and ran across an Emerson-brand 27,000 mAh Power Bank with PD 140-Watt and Intelligent Digital TFT Display. It is probably trash, and as far as I am aware, Emerson is just a shell of what it used to be, but the model reminded me of my Anker Prime A1340 27,650 mAh 250W beast. And this Emerson was only $32.31 (+ tax) with free ship to store. So I've just purchased one and it should arrive to my local Home Depot by Jan. 2. I can find virtually no information about it. Walmart has it for the same price so it is obviously being supplied by a third party. QVC has it for $66. A "manual" is available for it at Emerson Radio. Anyway, I'm willing to gamble for the price, and once it arrives, I'll report back here if it seems worth it or not.

Here's the link at Home Depot:
https://www.homedepot.com/p/Emers.../334340168

Here's the link at Walmart:
https://www.walmart.com/ip/Emerso...4676724163

Here's the link at QVC:
https://www.qvc.com/emerson-power...24607.html

Here's where you can find the User Manual:
https://www.emersonradio.com/docu...goryId=514

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So I was surfing the other day and ran across an Emerson-brand 27,000 mAh Power Bank with PD 140-Watt and Intelligent Digital TFT Display. It is probably trash, and as far as I am aware, Emerson is just a shell of what it used to be, but the model reminded me of my Anker Prime A1340 27,650 mAh 250W beast. And this Emerson was only $32.31 (+ tax) with free ship to store. So I've just purchased one and it should arrive to my local Home Depot by Jan. 2. I can find virtually no information about it. Walmart has it for the same price so it is obviously being supplied by a third party. QVC has it for $66. A "manual" is available for it at Emerson Radio. Anyway, I'm willing to gamble for the price, and once it arrives, I'll report back here if it seems worth it or not.

Here's the link at Home Depot:
https://www.homedepot.com/p/Emers.../334340168

Here's the link at Walmart:
https://www.walmart.com/ip/Emerso...4676724163

Here's the link at QVC:
https://www.qvc.com/emerson-power...24607.html

Here's where you can find the User Manual:
https://www.emersonradio.com/docu...goryId=514

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Yesterday 09:05 PM
6,790 Posts
Joined Oct 2009
SammieSocal25Yesterday 09:05 PM
6,790 Posts
This looks identical to the Energizer one on Amazon.
one review on Amazon states that the battery is about 55% capacity.
https://a.co/d/6CXg7dU
Last edited by SammieSocal25 December 23, 2025 at 02:07 PM.
Yesterday 09:20 PM
1,717 Posts
Joined Dec 2010
deeznutz206Yesterday 09:20 PM
1,717 Posts
Quote from SammieSocal25 :
This looks identical to the Energizer one on Amazon.
one review on Amazon states that the battery is about 55% capacity.
https://a.co/d/6CXg7dU
$32 for 55% capacity sounds about right lol

The Walmart link is actually sold and shipped from Walmart. Tempted to pick it up and return it if it is crap.
Original Poster
Yesterday 09:32 PM
468 Posts
Joined Dec 2018
wordage
Original Poster
Yesterday 09:32 PM
468 Posts
Quote from SammieSocal25 :
This looks identical to the Energizer one on Amazon.
one review on Amazon states that the battery is about 55% capacity.
https://a.co/d/6CXg7dU
Oh, great find--yes, that pretty much looks identical except the Energizer vs. Emerson labeling.

I just saw the 55% review on Amazon that you mentioned--folks often just think they can divide a power bank's capacity (in mAh) by their phone's capacity (also in mAh) to figure out how many charges they can get. It does not work this way. There are losses due to efficiency on both bumping Li-ion nominal 3.7/4.2V voltage up to USB's 5V, and then on the receiving device, downstepping it and recharging the batteries in that recipient device. There are efficiency losses every step of the way. Even primo devices like my Anker Prime A1340 must obey the laws of physics.

I am under no illusion that this Emerson power bank does not exaggerate its specs! But for $32.31 and the nifty TFT screen (if you are a geek), I am willing to give it a shot.

When it comes in, I'll try to devise a side-by-side test with the Anker Prime A1340 to see how it fares.
Original Poster
Yesterday 09:37 PM
468 Posts
Joined Dec 2018
wordage
Original Poster
Yesterday 09:37 PM
468 Posts
Unfortunately, every one of the Amazon reviews for the Energizer version is a Vine-incentivized review, which I usually consider less reliable than a normal, non-sponsored review... I wish there was a way to filter out these Vine-incentivized reviews. It does not matter very much in this case as there are so few reviews to start.
Yesterday 09:55 PM
3,111 Posts
Joined Dec 2008
casetronicYesterday 09:55 PM
3,111 Posts
Quote from wordage :
Oh, great find--yes, that pretty much looks identical except the Energizer vs. Emerson labeling.I just saw the 55% review on Amazon that you mentioned--folks often just think they can divide a power bank's capacity (in mAh) by their phone's capacity (also in mAh) to figure out how many charges they can get. It does not work this way. There are losses due to efficiency on both bumping Li-ion nominal 3.7/4.2V voltage up to USB's 5V, and then on the receiving device, downstepping it and recharging the batteries in that recipient device. There are efficiency losses every step of the way. Even primo devices like my Anker Prime A1340 must obey the laws of physics.I am under no illusion that this Emerson power bank does not exaggerate its specs! But for $32.31 and the nifty TFT screen (if you are a geek), I am willing to give it a shot.When it comes in, I'll try to devise a side-by-side test with the Anker Prime A1340 to see how it fares.
55% is still really in-efficient right? I'm interested in a real review as well. Since this is a rebadged unit, wonder who OEMs it and what the real specs are, at 1/3 price of an Anker Prime would be awesome deal if it's well built.
Original Poster
Today 12:05 AM
468 Posts
Joined Dec 2018
wordage
Original Poster
Today 12:05 AM
468 Posts
Quote from casetronic :
55% is still really in-efficient right? I'm interested in a real review as well. Since this is a rebadged unit, wonder who OEMs it and what the real specs are, at 1/3 price of an Anker Prime would be awesome deal if it's well built.
Right, I do not think poor efficiency would cause such a difference. My understanding is that some operations like converting/stepping-up 3.7V to 5.0V might be like 90% efficient, and so this does not take one down to 55%. But a bunch of other factors like the charge/discharge rate come into play, too. Again, I do not think this would cause an apparent 45% loss to efficiency. But the reviewer mentioned he noticed some rapid and abrupt drops in capacity according to the on-device meter, and he even suggested his meter might have a problem. One other point is that he said he saw max charge rates of 20W, but that is completely out-of-line with the published specs, which say it can take 140W of input. Anyway, I'll report back here when mine arrives, and try to give it a side-by-side with the A1340.
Original Poster
Today 12:24 AM
468 Posts
Joined Dec 2018
wordage
Original Poster
Today 12:24 AM
468 Posts
Okay, so I just asked ChatGPT for its wisdom about this--much better explanation than I was giving! You can read it for yourself at:

https://chatgpt.com/share/694b314...1edd4b85fa

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Today 01:11 AM
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Joined Dec 2008
casetronicToday 01:11 AM
3,111 Posts
Quote from wordage :
Right, I do not think poor efficiency would cause such a difference. My understanding is that some operations like converting/stepping-up 3.7V to 5.0V might be like 90% efficient, and so this does not take one down to 55%. But a bunch of other factors like the charge/discharge rate come into play, too. Again, I do not think this would cause an apparent 45% loss to efficiency. But the reviewer mentioned he noticed some rapid and abrupt drops in capacity according to the on-device meter, and he even suggested his meter might have a problem. One other point is that he said he saw max charge rates of 20W, but that is completely out-of-line with the published specs, which say it can take 140W of input. Anyway, I'll report back here when mine arrives, and try to give it a side-by-side with the A1340.
Ok so according to this guy who reviews power banks the average efficiency even for name brands like Anker is around 65%, so 55% isn't waaay off that number. And that's not just for charging devices from the power bank, that efficiency is also for recharging the power bank itself from the wall....like, power banks are just stupid in-efficient I guess.

https://youtu.be/HgpSMry1n9Y?si=vJk6fwsVK-2I8G-r

What is still concerning is the sudden drop in overnight capacity while idling....it happens to this crappy Marasone bank I got from Woot.
1
Original Poster
Today 02:29 AM
468 Posts
Joined Dec 2018
wordage
Original Poster
Today 02:29 AM
468 Posts
Quote from casetronic :
Ok so according to this guy who reviews power banks the average efficiency even for name brands like Anker is around 65%, so 55% isn't waaay off that number. And that's not just for charging devices from the power bank, that efficiency is also for recharging the power bank itself from the wall....like, power banks are just stupid in-efficient I guess.

https://youtu.be/HgpSMry1n9Y?si=vJk6fwsVK-2I8G-r

What is still concerning is the sudden drop in overnight capacity while idling....it happens to this crappy Marasone bank I got from Woot.
Wow, didn't know a 65% efficiency was the average for even the better brands!

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