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expired Posted by DesertGardener | Staff • Apr 13, 2023
expired Posted by DesertGardener | Staff • Apr 13, 2023

WEWATCH 20,000mAh 65W USB-C PD Portable Charger Power Bank

+ Free Shipping

$20

$70

71% off
Wemax
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Deal Details
Wemax has WEWATCH 20,000mAh 65W USB-C PD Portable Charger Power Bank (WPB201) for $69.99 - $49.99 w/ discount code XW8DDMJCF53P = $20. Shipping is free.

Thanks to Slickdeals Staff Member DesertGardener for posting this deal.

Features:
  • 20,000mAh Battery Capacity at 3.6V
  • USB-C w/ Power Delivery; 65W Output/45W Input
  • Dual USB-A Ports (30W Total Output)
  • 4 LED Indicators; shows battery charge level

Editor's Notes

Written by SubZero5 | Staff
  • About this deal:
    • While supplies last.
  • About this product:
    • 1-Year Warranty
  • About this store:
    • See Wemax return policy here.

Original Post

Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Wemax has WEWATCH 20,000mAh 65W USB-C PD Portable Charger Power Bank (WPB201) for $69.99 - $49.99 w/ discount code XW8DDMJCF53P = $20. Shipping is free.

Thanks to Slickdeals Staff Member DesertGardener for posting this deal.

Features:
  • 20,000mAh Battery Capacity at 3.6V
  • USB-C w/ Power Delivery; 65W Output/45W Input
  • Dual USB-A Ports (30W Total Output)
  • 4 LED Indicators; shows battery charge level

Editor's Notes

Written by SubZero5 | Staff
  • About this deal:
    • While supplies last.
  • About this product:
    • 1-Year Warranty
  • About this store:
    • See Wemax return policy here.

Original Post

Community Voting

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Top Comments

There's a bit of misinformation in this thread because of the mah conversion due to the voltage difference. I should mention I'm not advocating this product and have no idea how well it works.

As per the Amazon review picture, the capacity is 20000 mah @ 3.6v and the rated capacity is 11000 mah @ 5v. The difference in voltage causes a difference in mah and the rated capacity usually takes in the loss conversion (usually 25% loss is calculated as stated by Anker).

The equation from stated capacity to rated is: 3.7v x Advertised capacity x efficiency / 5v. Plugging in the numbers: 3.7 x 20000 x 0.75 / 5 = 11,100 mah @ 5v which is what is stated on the power bank.

So TLDR: 11000mah @ 5v is the same as 20000 @ 3.7v with conversion loss and powerbanks should just use Wh as to measure capacity instead of mah to avoid this confusion.
Read the reviews on this. It's likely nowhere near 20000mah capacity. Device itself has 11000mah printed on it as rated capacity.
The 11000mAh is if you count the 5V charging. The battery is indeed 20000mAh capacity battery. As with anything, there is loss if you convert. In this case, it is 3.6V to 5V. And the loss is more if you convert from 3.6V to the 20V if you are using the type C PD port. Use watt-hours for your calculations.

3.6V*20Ah = 72Wh.
5V*11Ah = 55Wh.
That is 17Wh of loss converting or 55/72 = 76.4% efficiency

This efficiency is usually expected because this design is probably boosting and then bucking to get the continuous 5V. A better design is to just boost, but it gets tricker to regulate the voltage constantly at 5V. And the design is probably more complicated to just do boost without bucking.

90 Comments

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Apr 13, 2023
1,362 Posts
Joined May 2018
Apr 13, 2023
vaiof1
Apr 13, 2023
1,362 Posts
Is it a good idea to be constantly charging the power bank?
1
Apr 13, 2023
666 Posts
Joined Nov 2016
Apr 13, 2023
alan11
Apr 13, 2023
666 Posts
good price.
does it has passthrough?
Apr 13, 2023
511 Posts
Joined Jul 2022

This comment has been rated as unhelpful by Slickdeals users.

Apr 13, 2023
250 Posts
Joined May 2008
Apr 13, 2023
capntang
Apr 13, 2023
250 Posts

Our community has rated this post as helpful. If you agree, why not thank capntang

Read the reviews on this. It's likely nowhere near 20000mah capacity. Device itself has 11000mah printed on it as rated capacity.
7
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Apr 13, 2023
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Apr 13, 2023
DesertGardener
Apr 13, 2023
Original Poster
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10,867 Posts
Quote from alan11 :
good price.
does it has passthrough?
On the Amazon page they answered "It can support pass through charging. But the charging rate will be slower."

Quote from capntang :
Read the reviews on this. It's likely nowhere near 20000mah capacity. Device itself has 11000mah printed on it as rated capacity.


From the Amazon reviews, the print on the charger and manual show 20,000mah.
5
Apr 13, 2023
250 Posts
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Apr 13, 2023
capntang
Apr 13, 2023
250 Posts

Our community has rated this post as helpful. If you agree, why not thank capntang

Quote from DesertGardener :
On the Amazon page they answered "It can support pass through charging. But the charging rate will be slower."





From the Amazon reviews, the print on the charger and manual show 20,000mah.
Attached image from Amazon reviews clearly shows matching model number and rated capacity of 11000mah.
Last edited by capntang April 13, 2023 at 09:00 AM.
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Apr 13, 2023
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Apr 13, 2023
DesertGardener
Apr 13, 2023
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Quote from capntang :
Attached imaged from Amazon reviews clearly shows matching model number and rated capacity of 11000mah.

Ah, I see now. Thanks for mentioning!
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Apr 13, 2023
532 Posts
Joined Dec 2010
Apr 13, 2023
DoctorFunk
Apr 13, 2023
532 Posts
Good deal even if it's just 11000mah
7
Apr 13, 2023
3,830 Posts
Joined Jan 2011

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Apr 13, 2023
482 Posts
Joined May 2019
Apr 13, 2023
E_M__
Apr 13, 2023
482 Posts
3.6v/5v = .72. So from voltage step-up, max capacity is 14,400. If rated capacity is 11,000mAH, backing into a conversion rate gets us to.. 76.4%. That's.. not great..

I guess $20 is still fine for what you get, but what you get is some really cheap components.
1
Apr 13, 2023
312 Posts
Joined Jun 2015
Apr 13, 2023
dima13
Apr 13, 2023
312 Posts
Will this do super fast charging 2.0 on an S22 Ultra phone? If anyone knows please advise
1
Apr 13, 2023
58 Posts
Joined Nov 2003
Apr 13, 2023
Smartbomb
Apr 13, 2023
58 Posts

Our community has rated this post as helpful. If you agree, why not thank Smartbomb

There's a bit of misinformation in this thread because of the mah conversion due to the voltage difference. I should mention I'm not advocating this product and have no idea how well it works.

As per the Amazon review picture, the capacity is 20000 mah @ 3.6v and the rated capacity is 11000 mah @ 5v. The difference in voltage causes a difference in mah and the rated capacity usually takes in the loss conversion (usually 25% loss is calculated as stated by Anker).

The equation from stated capacity to rated is: 3.7v x Advertised capacity x efficiency / 5v. Plugging in the numbers: 3.7 x 20000 x 0.75 / 5 = 11,100 mah @ 5v which is what is stated on the power bank.

So TLDR: 11000mah @ 5v is the same as 20000 @ 3.7v with conversion loss and powerbanks should just use Wh as to measure capacity instead of mah to avoid this confusion.
Last edited by Smartbomb April 13, 2023 at 09:55 AM.
16
Apr 13, 2023
172 Posts
Joined Sep 2019
Apr 13, 2023
Mdacompact
Apr 13, 2023
172 Posts
Just in for one and be notcied that it pay directly to China vendor - " 深圳市橙汁能量科技有限公司 ([email protected])"
5
Apr 13, 2023
3,983 Posts
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Apr 13, 2023
LeviathanUltima
Apr 13, 2023
3,983 Posts

Our community has rated this post as helpful. If you agree, why not thank LeviathanUltima

The 11000mAh is if you count the 5V charging. The battery is indeed 20000mAh capacity battery. As with anything, there is loss if you convert. In this case, it is 3.6V to 5V. And the loss is more if you convert from 3.6V to the 20V if you are using the type C PD port. Use watt-hours for your calculations.

3.6V*20Ah = 72Wh.
5V*11Ah = 55Wh.
That is 17Wh of loss converting or 55/72 = 76.4% efficiency

This efficiency is usually expected because this design is probably boosting and then bucking to get the continuous 5V. A better design is to just boost, but it gets tricker to regulate the voltage constantly at 5V. And the design is probably more complicated to just do boost without bucking.
2

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Apr 13, 2023
1,351 Posts
Joined Aug 2011
Apr 13, 2023
a_land
Apr 13, 2023
1,351 Posts
so in battery mode, does it charge devices at 65w?

i am looking for a smaller battery for my steam deck and this would fit the bill (hopefully)

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