Review: Vinsic Slim 20,000mAh Power Bank

Vinsic 20,000mAh Power Bank









  • Has lots of charging options from Fast standard charging, Quick Charge 3.0 and USB Type-C
  • Uses a LCD Display to show power capacity and the display is touch screen, so you can tap it to turn it off and on
  • Has Enough capacity to charge smartphones plenty of times, and iPads can charge 1.5-2 times.


  • The conversion rate could be better to provide more Output Capacity


High capacity power banks are becoming more advanced simply because they’re able to have more features because of their increased size.

It’s with the larger power capacity, that these portable chargers can exceed in areas of design and power.

With that said, these kinds of changes aren’t the best to take with you on-the-go but the increased features may just make you get them because of the convenience and awesome capabilities that these portable chargers hold.

This is the Vinsic 20,000mAh slim power bank, or at least in terms of a 20,000mAh power bank it’s slim. Although, this shouldn’t be mistaken for Vinsic’s other 20,000mAh charger.

Similar Power Banks:

EasyAcc MegaCharge 16,750mAh Power Bank


Power Capacity

The initial power capacity is 20,000mAh and the Output power capacity is going to depend on how you’re using the power bank. This is because the power bank has 3 Output ports.

So if you’re using all 3 at the same time, then the Output power capacity will be lower and the fewer Output you use, the more Output power capacity you will be able to use.

With all that said, let’s calculate just how much fo the initial power capacity you’re able to use towards charging your devices.

3.7 x 20,000 = 74,000 / 5 = 14,800

Charging for Smartphones

So, an Output capacity of 14,800mAh is still going to be able to provide lots of charges to smartphones, we’re talking about 5 times or more for most smartphones.

Charging for Tablets

If you’re charging devices like tablets, then the power bank can charge higher-end iPads that have bigger battery capacities to full capacity only once if you’re taking full advantage of the power bank’s power.

However, if you’re charging lower-end iPads with smaller capacities, then you can expect 1.5 charges.

It’s important to know that when you’re charging a tablet and want it to charge to full, then it’s best to charge it alone.

DevicesVinsic 20,000mAh Power Bank (Output Capacity = 16,000mAh)Phone CapacityVinsic 20,000mAh Power Bank Left Over Capacity after One Charge

# of Full Charges for the Device
iPhone SE16,000mAh1,624mAh14,376mAh

9.8 Full Charges
iPhone 616,000mAh1,810mAh14,190mAh

8.8 Full Charges
iPhone 6 Plus16,000mAh2,915mAh13,085mAh

5.4 Full Charges
iPhone 6s16,000mAh1,715mAh14,285mAh

9.3 Full Charges
iPhone 6s Plus16,000mAh2,750mAh13,250mAh

5.8 Full Charges
Samsung Galaxy S616,000mAh2,550mAh13,450mAh

6.2 Full Charges
Samsung Galaxy S6 Edge16,000mAh2,600mAh13,400mAh

6.1 Full Charges
Samsung Galaxy S716,000mAh3,000mAh13,000mAh

5.3 Full Charges
Samsung Galaxy S7 Edge16,000mAh3,600mAh12,400mAh

4.4 Full Charges

Output Charging:


QC USB Output: DC 3.6-6.5V/3A | 6.5-9V/2A | 9-12V/1.5A

For those that have smartphones that are compatible with Quick Charge, this Vinsic power bank features Quick Charge 3.0.

So if you’re charging a smartphone that can charge at Quick Charge speeds, then you’ll be able to take advantage of constant fast charging as there are 3 Amperage ranges with 3, 2, and 1.5 Amps.

The higher the Amperage the lower the Voltage, but even with the highest Amperage of 3 Amps, the Voltage can still be 3.6-6.5 Volts.

The lower the Amperage, the higher the voltage, so even if the charging speed (Amperage) goes down during charging for Quick Charge, with the Voltage being high, the charging speed is more constant.

You can also charge Non-Compatible Quick Charge smartphones and other devices with the Quick Charge port and it’ll just output 5V/2.4A to those devices.

Standard USB Output: DC 5V/2.4A

Then there’s the standard USB port that can deliver a Max Standard charging speed of 2.4A.

This port will be able to charge most devices at their max charging speed, except for Quick Charge compatible devices because you’d connect those devices to the Quick Charge port.

Overall, this port is nearly equivalent to the Quick Charge port other than the fact that it doesn’t have Quick Charge. It’s best to use a tablet with this port and many smartphones that you’d like.

Type-C Output: DC 5V/3A

Something that is becoming more common with high capacity power banks is the usage of a Type-C Output.

The Type-C port can be used as both as an Input and Output port but we’re talking about the Output side of it.

To use the Type-C port as an Output, you’re going to have to use a Type-C to Type-C charging cable to use it with devices that are compatible to charge with Type-C.

So you can even use this power bank to charge the newer Macbook models that use Type-C but be warned that the voltage amount doesn’t meet the standard charging requirements for a Macbook and so it’ll charge a USB-C MacBook quite slowly.

You can also use the USB-C port for charging USB-C compatible smartphones and tablets.

Input Charging:

Micro USB Input: 5V/2.4A | 9V/2A

Type-C Input: 5V/3.0A

There are 2 ways to recharge the power bank, either with the Micro-USB port or the Type-C port. With that said, you can only use one or the other to recharge the power bank.

Also, we thought that the Type-C Input would provide faster charging than the Micro-USB Input port but that’s not the case because the Micro-USB uses Quick Charge with its recharging.

However, the Type-C input comes close with its a 5V/3.0A recharging speed.

The best wall charger to use when recharging this power bank is to use a Quick Charge wall charger and doing so will result in a 6-7 full recharge time.

Jackery Black420 Power Bank with Quick Charge 3.0



Size and Weight

It’s a large and heavy power bank, and that’s really to the point.

The length of the power bank is 6.1 inches, the width is 3.5 inches and the thickness of the power bank is 0.83 inches. It’s a heavy charger weighing in at 14.9 ounces.

It’s not comfortable to hold this power bank even if you’re charging a single device because it’s large so it’s difficult to fit it into a single hand. So it’s best to set it down and use. Of course, it’s meant to be set down and used if you’re charging more than a single device.

Functional Components

All the functional parts of the power bank can be found on a single panel on the power bank.

On the side panel, you’ll find the 2 USB charging ports, the Type-C port, and the Micro-USB port.

There’s also the LCD power capacity display that shows power capacity in a percentage way.

There’s no power button, or rather there is a power button but it’s not the kind of traditional power button. The power capacity display is the power button because the display is a touch display.

When you double-tap the display, the power capacity of the power bank shows up and when the power bank is on, you can just tap the display again to turn it off.


An LCD to show power capacity is steadily growing as other power banks such as the Lumina and iMuto use the same system, although the ability of it being touchscreen is not nearly as common.


Structure and Material

It’s a well-built power bank with the charger not having too many separate pieces.

The centerpiece is just two pieces that are connected and then there are the two side panels. The material that’s used is ABS, which is a higher quality plastic material that can withstand more constant wear.

With that said, it’s still just a normal portable charger and has no special physical traits that make it strong like a rugged power bank. So it’s best to take caution while you’re walking so you don’t drop it.


On the tech build side of things, there’s nothing too special, since the power bank doesn’t use any special batteries to improve its conversion rate but it does well with lots of safety tech features.

These safety techs include Short-Circuit protection, Temperature Control, Over-Voltage, and Over-Current Protection.

iMuto 20,000mAh Power Bank with Quick Charge


The reliability of this high capacity power bank is answered for itself.

With its high capacity that can potentially last for days or even weeks and plenty of charging options, this power bank is very reliable.

However, the reliability range is going depend on how you’re using the power bank. If you’re ONLY using the USB Standard charging port, then there’s not much reason to purchase the charger.

If you’re also charging 2 devices using both of the USB ports then the reliability increases more and if you’re using all 3 Output ports then reliability is at an all-time high.

You don’t have to be using all the Output ports at the same time for reliability to be considered good but if you’re taking advantage of what they have to offer, then this portable charger will prove to be very reliable.



It has a high power capacity but depending on the way you use it, the Output power capacity can be quite a bit lower than 20,000mAh.

There are 3 Output charging options and each of them can provide fast charging. There are 2 ways to recharge the Vinsic power bank, either through the Micro-USB or Type-C port.


It’s a manageable power bank but with that said, it’s not very comfortable to hold and use. So it’s best to just set it down and use it.

The most notable thing is that it doesn’t have a power button, instead, you can tap the power capacity display to turn it on and off.


Nothing too special about the build but it does hold up well.


Reliability for a power bank like this is usually high but in this case, it’s going matter if you’re using the most of the charging options it has.

More High Capacity Power Bank Reviews

Specs of the Vinsic 20,000mAh Power Bank:

  • Power Capacity: 20,000mAh
  • Output:   Max Output:

QC USB Output: DC 3.6-6.5V/3A | 6.5-9V/2A | 9-12V/1.5A

Standard USB Output: DC 5V 2.4A

Type-C Output: DC 5V 3A

  • Input:

Micro USB Input: 5V/2.4A | 9V/2A

Type-C Input: 5V/3.0A

  • LED Power Indicators: LCD Power Capacity Display
  • Size: 6.1 x 3.6 x 0.8 inches
  • Weight: 14.9 Ounces


The Vinsic 20,000mAh power bank can offer a variety of ways to charge and has uncommon design abilities.

It’s a portable charger that could use some improvements with some tech build but other than that it does well in the high capacity arena of power banks.