It’s harder than you think to find a high-capacity power bank that can keep you going long after your phone’s battery fails on you. We’ve covered a variety of power banks and charging solutions over the years at TechNorms in pursuit of finding the best power bank available in the market.

This time we’re tackling the relatively new and popular VINSIC 20000mAh Ultra-Slim Power Bank. Let’s look at how the VINSIC 20000mAh Ultra-Slim Power Bank lives up to its reputation of being a beast when it comes to portable charging. Continue on for our review of this high-capacity power bank.

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VINSIC Ultra-Slim Power Bank Review

From the start, this VINSIC power bank boasts being able to charge an iPhone 5/5S up to ten times in one charge. It supports your typical slew of devices, such as phones, tablets and basically anything with USB support.


It came out of its beautiful packaging with about 56 percent of battery life ready to go. Don’t be deceived, this is a big power bank, not just in capacity but in size and weight:

  • Size: 6.8 x 4.8 x 0.5 inches
  • Weight: About one pound (~ 450 grams)

This is not your typical power bank, and if you’re looking for something inconspicuous to carry around with you to charge, this may not be it. It works well in a backpack or rolling bag, allowing you to charge and go. If you’re looking for a power bank you can conceal, this isn’t it and you’re looking for the wrong type of power bank. If you’re a power user, on the go or travel a lot, this power bank is a great investment for the price and capacity you get out of it.

It’s slim, sleek and comes in a variety of metallic colors. The one I am reviewing is a metallic silver and simply beautiful. It’s definitely the most beautiful power bank I’ve ever used and I’ve had several people ask me about it just on its look alone.

VINSIC 20000mAh is pretty slim for its size.

One of the unique features of the VINSIC 20000mAh power bank is its display. On most power banks, you press a button to see how much charge is left. On this power bank, you simply touch the display next to the charging ports. It’ll light up and tell you how much charge capacity is left. While charging devices, it stays lit up to let you know how it’s being used and turns off once a device is unplugged.

This VINSIC power bank is charged via micro USB either by wall charger or by another device on the go, although I recommend only charging via wall charger whenever possible. It took close to 12 hours to charge the power bank from zero percent to 100 percent, which isn’t too bad when you consider how much battery life it holds.

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I tested my Samsung Galaxy S5 and Samsung Galaxy Tab 3 with the VINSIC power bank and was incredibly impressed by how quickly and efficiently it charged both devices.

All ports are properly labeled.

It features both 2.1A and 1A charging ports. I found the charging quality on both to be on par with the output you should be getting when charging devices. You can charge two devices at the same time and in my experience it doesn’t seem to slow down charging on either device while doing so.

I was able to charge my Galaxy S5 in its normal amount of time from five percent to 100 percent with its 3.0 USB charging/data cable. It was only slightly slower with a generic USB charging cable. My tablet charged as normal, too, with a generic cable and in the 2.1A charging port.

This power bank utilizes a smart charging feature to avoid overcharging your devices. When they’re done charging, the power bank recognized this and turns off, so it not only saves your devices from the drawbacks of overcharging, but it also preserves the charge capacity of the power bank as well.


In my time reviewing various products over the years, I don’t think I’ve ever been impressed with the overall presentation and use of a product as I am with this VINSIC 20000mAh power bank.

I can’t say enough good things about it. If you can get over its size, which is the only real drawback, this power bank will keep you going over and over. If you’re looking for a power bank with a really large capacity, the VINSIC 20000mAh power bank is what you’ve been dreaming of.

Learn more about the VINSIC 20000mAh power bank here.

Disclaimer: The above company sent us the product for testing. However, that has not swayed my opinion of their product one way or another. All conclusions are based on at least a week of careful testing.

Further Reading: Need to Add Removable Storage to Your Samsung Galaxy S6? Here are 5 Ways to Do It