Monoprice Obsidian Speed Plus High-Powered USB-C Power Bank, 26,800mAh, 3-Port Up to 87W PD Output for Mobile Phones, Tablets, and Laptops
Product # 39750
$49.99
$69.99
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Questions and Answers
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Will this product allow you to charge other items while it's being charged too?
Kirk C
on Feb 12, 2020
BEST ANSWER: Thank you for your question.
That is possible but I Would keep in mind this is a power bank so it will hold a charge.
Once that power is gone it will have to get more power before it can charge anything.
That is possible but I Would keep in mind this is a power bank so it will hold a charge.
Once that power is gone it will have to get more power before it can charge anything.
- Reply(1)
- Inaccurate
- Tyler C Staff on Feb 12, 2020
BEST ANSWER: Thank you for your question.
That is possible but I Would keep in mind this is a power bank so it will hold a charge.
Once that power is gone it will have to get more power before it can charge anything.
That is possible but I Would keep in mind this is a power bank so it will hold a charge.
Once that power is gone it will have to get more power before it can charge anything.
- Reply(1)
- Inaccurate
- Tyler C Staff on Feb 12, 2020
so, in fact I can't charge it until it's empty or it won't accept a charge, even though its available, until its empty??
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- Inaccurate
- Andy S on Sep 29, 2020
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Will this work with a Surface Pro 7 through USB-C?
David T
on Feb 7, 2020
BEST ANSWER: Thank you for your question.
Yes, if the device has USB-C ports for charging this would be suitable.
Yes, if the device has USB-C ports for charging this would be suitable.
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- Inaccurate
- Tyler C Staff on Feb 7, 2020
BEST ANSWER: Thank you for your question.
Yes, if the device has USB-C ports for charging this would be suitable.
Yes, if the device has USB-C ports for charging this would be suitable.
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- Inaccurate
- Tyler C Staff on Feb 7, 2020
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What's the power output for the USB-A ports? Is there any fast-charging option with those ports, specifically for iOS devices?
Wayne A
on Feb 20, 2020
BEST ANSWER: Thank you for your question.
The USB-A ports on this device can pass up to 3A of power which would be enough for fast-charging.
The USB-A ports on this device can pass up to 3A of power which would be enough for fast-charging.
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- Inaccurate
- Tyler C Staff on Mar 6, 2020
BEST ANSWER: Thank you for your question.
The USB-A ports on this device can pass up to 3A of power which would be enough for fast-charging.
The USB-A ports on this device can pass up to 3A of power which would be enough for fast-charging.
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- Inaccurate
- Tyler C Staff on Mar 6, 2020
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Can this be taken aboard airplanes?
Donald M
on Feb 23, 2020
BEST ANSWER: Thank you for your question.
Yes, the batters are within FAA's limitations.
Yes, the batters are within FAA's limitations.
- Reply
- Inaccurate
- Tyler C Staff on Feb 24, 2020
BEST ANSWER: Thank you for your question.
Yes, the batters are within FAA's limitations.
Yes, the batters are within FAA's limitations.
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- Inaccurate
- Tyler C Staff on Feb 24, 2020
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what type of battery is inside this unit? Lithium, Nickel ?
A shopper
on Mar 7, 2020
BEST ANSWER: The Question is what type of Lithium cell is in this. Lithium ION or Lithium Polymer? Lithium ION I believe is banned from airplanes.
- Reply
- Inaccurate
- New User U on May 26, 2020
BEST ANSWER: The Question is what type of Lithium cell is in this. Lithium ION or Lithium Polymer? Lithium ION I believe is banned from airplanes.
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- Inaccurate
- New User U on May 26, 2020
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Which laptop or phone are not compatible with this powerbank?
New User U
on Mar 17, 2020
BEST ANSWER: Thank you for your question.
As long as the cable used to charge the device can connect to this bank it is compatible.
As long as the cable used to charge the device can connect to this bank it is compatible.
- Reply
- Inaccurate
- Tyler C Staff on Mar 18, 2020
BEST ANSWER: Thank you for your question.
As long as the cable used to charge the device can connect to this bank it is compatible.
As long as the cable used to charge the device can connect to this bank it is compatible.
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- Inaccurate
- Tyler C Staff on Mar 18, 2020
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Does this unit provide pass through? Can it provide power to a device while being charged?
David V
on May 16, 2020
BEST ANSWER: YESS. i have used it many time to charge my phone while charging the Bank
- Reply
- Inaccurate
- Gordon C on May 18, 2020
- Purchased on Mar 8, 2020
BEST ANSWER: YESS. i have used it many time to charge my phone while charging the Bank
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- Inaccurate
- Gordon C on May 18, 2020
- Purchased on Mar 8, 2020
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Do you have to push the button to start charging your phone, or will it start automatically when you connect your phone to this battery?
Charles C
on Oct 19, 2020
BEST ANSWER: need to push the button to start charging
- Reply
- Inaccurate
- Randy W on Feb 16, 2021
- Purchased on Mar 11, 2020
BEST ANSWER: need to push the button to start charging
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- Inaccurate
- Randy W on Feb 16, 2021
- Purchased on Mar 11, 2020
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What is the input Wattage since it doesn't come with a wall charger?
New User U
on May 27, 2020
Given that this is to be taken on trips, what is the size and weight?
Richard M
on Sep 5, 2020
Why is my power bank not turning on?
A shopper
on Jan 31, 2021
Reviews
4.5 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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Rated 4 out of 5
Charges a ton, but also weighs a ton
It’s huge but can charge a ton of things, so there is a trade off. Definitely won’t fit in a pocket with your phone.
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Rated 2 out of 5
Dissapointed
The C charger not included, ....Disappointing. No indication this cable is needed on description or suggestion.
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Rated 5 out of 5
Huge in size and capacity
I recharge my M1 MacBook, my iPad and iPhone with it. And have power to spare. No frills, well-built.

yes it's large.
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Rated 5 out of 5
Impressive and definitely would recommend
Excellent power bank. Easily charges my ipad pro from completely dead to 100% a few times. It is large and heavy but having this light wasn't the design as it is a large bank. Make sure to use a large 18W charger or larger to speed up the charging time.
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Rated 4 out of 5
Better than any usual phone power bank, and good for a PC in a pinch!
I had high hopes for this power bank and it met/exceeded almost all of them. Holds a lot of charge, so that I can quick-charge both my smartphones, a tablet, and still have enough juice for running my HP Spectre ultrabook. I docked one star because despite it having over 80 watts via USB-C, when on this power bank my PC won't charge the battery like it will with the original 65 watt ac adapter. I don't know if there's a setting to over-ride this, but it's mostly HP's fault for protecting the computer when on non-original power sources. I've noticed it does the same thing on Lenovo/Dell USB-C power cords as well. As a mobile PC repair tech this is a welcome addition to my toolbag, and good in a pinch. I think it should be good enough for BIOS/Firmware upgrades when you don't have access to an outlet, which is mostly what I needed it for. It would be worth even more money if it had an adapter to change the USB-C into common laptop dc plugs like the Lenovo rectangle etc.
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Rated 5 out of 5
So long as you don't need it to fit in your pocket, it's an awesome battery.
It's big and clunky for a portable battery, but will charge an XPS 15 2in1 9575 and a full charge on a note 9 won't even extinguish the first charge light on the battery. Also, it charges very fast if you're using a 60w pd charger. If you don't have a PD charger, prepare for it to take about a day to charge at 5v/2.4a.

Battery specs
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Rated 5 out of 5
I use this thing everyday, and I don't have to charge it everyday.
When I am working in the field away from my office I don't usually have enough battery life to make it through the day. I have been using this daily to recharge my phone, chromebook etc. With several hours of use each day charging various devices I only have to recharge it once or twice a week. It charges very quickly and it charges other devices quickly. I have been charging it with https://www.monoprice.com/product?c_id=309&cp_id=30902&cs_id=3090202&p_id=24425&seq=1&format=2 They both work great!
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May 23, 2020
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Rated 5 out of 5
Beast of a Power Bank
This Power Bank is simply amazing! I use it to power/charge a MacBook Pro 15in 2019 Model, a Samsung S20 Ultra 5G, and a pair of Galaxy Buds+.
The purpose was to keep my devices going throughout my workdays, being a first responder with the Covid-19 pandemic my days have been extended to 15hrs-30 hr. long workdays which consist of driving and being in remote locations or facilities that are not our own. Hence a power bank to replace my chargers.
I have been wanting to purchase a power bank for quite a while, and picked one up locally, but it failed miserably at fast charging my power-hungry devices.
I put this charger to work this past weekend and it has impressed me, it was able to keep my devices charged and most importantly my Cellphone which I use to GPS and get dispatched.
It charges my MacBook at 87w verified through the system report, it charges my S20 at 45w, and the power bank charges up in 3hrs, I typically get 4hrs of sleep on average busy days, so this is perfect for me! The size factor is smaller than I expected, however it is heavier than expected.
The only down sides were that I had to purchase a 60w charger, and a longer usb c cable.
I did order all 3 items at once though and recommend the same, for the charger I purchased Product # 24425, and for the cable I purchased Product # 39630
The purpose was to keep my devices going throughout my workdays, being a first responder with the Covid-19 pandemic my days have been extended to 15hrs-30 hr. long workdays which consist of driving and being in remote locations or facilities that are not our own. Hence a power bank to replace my chargers.
I have been wanting to purchase a power bank for quite a while, and picked one up locally, but it failed miserably at fast charging my power-hungry devices.
I put this charger to work this past weekend and it has impressed me, it was able to keep my devices charged and most importantly my Cellphone which I use to GPS and get dispatched.
It charges my MacBook at 87w verified through the system report, it charges my S20 at 45w, and the power bank charges up in 3hrs, I typically get 4hrs of sleep on average busy days, so this is perfect for me! The size factor is smaller than I expected, however it is heavier than expected.
The only down sides were that I had to purchase a 60w charger, and a longer usb c cable.
I did order all 3 items at once though and recommend the same, for the charger I purchased Product # 24425, and for the cable I purchased Product # 39630

Size Ref.
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Rated 5 out of 5
Amazing power horse!
Solid built and a power horse. Powers both macbook pro and ipad pro and can also charge an iphone. It is a monster. Only thing to say bad its the $100 price tag and its bigger than the usual power bank ive owned. make sure you read the dimensions so you know what you are getting.
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Rated 5 out of 5
USB-C output will charge a MacBook pro!
Haven’t had this long enough to comment on battery life or other features. The most important thing to me was it’s ability to extend the runtime of my MacBook pro’s internal battery and it does that without issue. The short USB-C cable it comes with registers with the Mac as a regular 80+ watt charger so it should have no problem charging the battery and keeping up with the most energy inefficient things you need to do. I will update or review again if I find any problems, but for the moment I am very happy with it. Note that when charging or powering a MacBook the cable you use is VERY important. It doesn’t matter how much power the charger or powerbank can put out if your cable doesn’t rate itself for that amount of power. I have purchased several cables and labeled them as to the maximum current they will transfer. If you connect to this, or any USB-C device, and find that the input is less than what it should be able to provide it is more likely to be a bad or cheap cable than the device itself. The MacBook pro in question is a 15 inch 2019 and when using the secondary high powered video chip and not the embedded video it will easily use 80 watts of power and tax any of the available powering devices.
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