Review: Zendure A3 10,000mAh Portable Charger

Zendure A3 Portable Charger











  • Has Enough power capacity to charge a single smartphone about 3 times or more. Tablets can possibly charge 1 full time.
  • Both of the charging ports are able to share Charging Current.
  • Very strong physical build with the use of ABS and a Rubber belt that is able to take shock damage from falls.


  • Output Max Charging could be better and so can the recharge speed.
  • Needs to have better conversion.


We’ve reviewed another Zendure power bank in the past called the Zendure A2 and it was pretty good. Although it only had one charging port and as a result, there wasn’t much to prove with its minimal power capacity and straightforward charging speed.

In this Charger Harbor review, we’re reviewing the Zendure A3, a few steps above the A2.

Let’s see if this 2-port power bank is able to provide more and is more able to prove itself in the portable charging arena.

Aukey 10,000mAh Power Bank with Two Ports


Power Capacity

The initial power capacity of the power bank is 10,000mAh and the Output capacity that you’re going to receive with this power bank isn’t that bad. This is mostly because the Output charging speed isn’t that fast and as a result, not much heat is generated and that means conversion is better.

With that said, even if you’re using the Max Output of the power bank which is 2.1A, then you’re going to get an Output capacity of about 7,500mAh. The Output capacity can even be higher if you’re charging at slower speeds.

An Output capacity of 7,500mAh is still very versatile with how it can be used. For smartphones, the power capacity is very useful as you can charge smartphones 3 times or more.

Even if you’re charging 2 smartphones at the same time, you can expect at least 2 charges for both smartphones that are charging; as long as their battery capacities are small enough to make use of the entire power capacity that the power bank has to offer.

If you’re going to charge a tablet with this power bank, then it’s best to only charge the tablet alone. This is for 2 main reasons. Reason 1 is that when you charge the tablet alone, it will be able to charge fast at 2.1A and Reason 2 is that is can take advantage of more power capacity.

This way, the tablet can charge to full or at least near its full battery capacity.

DevicesZendure A3 Portable Charger (Output Capacity = 7,500mAh)Phone CapacityZendure A3 Portable Charger Left Over Capacity after One Charge

# of Full Charges for the Device
iPhone SE7,500mAh1,624mAh5,876mAh

4.6 Full Charges
iPhone 67,500mAh1,810mAh5,690mAh

4.1 Full Charges
iPhone 6 Plus7,500mAh2,915mAh4,585mAh

2.5 Full Charges
iPhone 6s7,500mAh1,715mAh5,785mAh

4.3 Full Charges
iPhone 6s Plus7,500mAh2,750mAh4,750mAh

2.7 Full Charges
Samsung Galaxy S67,500mAh2,550mAh4,950mAh

2.9 Full Charges
Samsung Galaxy S6 Edge7,500mAh2,600mAh4,900mAh

2.8 Full Charges
Samsung Galaxy S77,500mAh3,000mAh4,500mAh

2.5 Full Charges
Samsung Galaxy S7 Edge7,500mAh3,600mAh3,900mAh

2.0 Full Charges
Samsung Galaxy S8+7,500mAh3,500mAh4,000mAh

2.1 Full Charges

Output Charging: Either Port: 5V/2.1A    Max Output: 5V/2.1A

Output charging, the charging speed that your devices will receive is very mediocre. So the Max Output of the power bank is 2.1A and both of the ports can deliver 2.1 Amps but it can only do it at any one time.

So if you’re charging a single device with the charger then it’s pretty good as the potential charging speed for the device will be 2.1 Amps. When you’re charging only a single device, the device will be able to charge either at or near its max charging speed.

However, when you connect 2 devices, that’s when the power bank’s charging speed becomes a lot weaker.

This is because the Max Output of 2.1A becomes split between the charging ports and as a result, both of the devices you’re charging are going to receive only 1 Amp of charging speed. This is very bad for both smartphones and tablets since even smartphones have their max charging speed above 1 Amp at times.

In this kind of Output Charging, we even think that power banks like the Aukey 10,000mAh and Aibocn portable charger with 3.1A Max Outputs without shared Charging Current are better than what the Zendure A3 is currently offering.

Input Charging: 5V/1.5A

The Input charging could be better with a power bank that has an initial power capacity of 10,000mAh. If you’re using a 2 Amp wall charger or higher then you’re going to be able to recharge it quickly as a possible and you can expect a full recharge within 8 hours.

However, if you’re using a lower Amperage wall charger like a 1 Amp wall charger, then you’re going to be waiting 10+ hours for a full recharge.

Similar Power Bank


Size and Weight

Like many of other Zendure’s portable chargers, this one isn’t that large or heavy. We think it matches the perfect balance of holding or setting it down to use it when the time comes.

The length is 3.8 inches, 2.5 inches in width and 1 inch in thickness. It’s somewhat light at 7.2 ounces and we consider that to be on the light side as it doesn’t even weigh half a pound.

So it’s actually manageable to hold it in a single hand and use it while you’re holding your smartphone in the other hand. Of course, if you’re charging 2 devices, then you can just set it down.


Functional Components

It’s a very predictable layout and that’s a good thing. The 2 Output charging ports and Micro-USB port are on the same side. There is a power button and 4 LED power capacity indicators on top of the power bank.

The power button isn’t used very much other than the use of it being pressed to check the power capacity. This is because charging automatically begins when you connect a device into the power bank.

KMASHI 10,000mAh Power Bank


Structure and Material

One of the best parts of Zendure’s power banks is their build quality.

The outer part of the power bank is may look like metal but it’s actually plastic. However, it’s not just any plastic, the plastic is ABS grade which is much stronger than traditional plastic. The body of the power bank is separated into 2 pieces, with a top and bottom part, so there aren’t many pieces to account for to get damaged.

In between the 2 ABS body pieces, is a rubber belt that wraps around the middle part. The rubber piece is able to take shock damage from falls.



On the tech side of things, there aren’t many special attributes to the power bank other than it having safety tech. Well, there is metal shielding that goes around the battery cells and this is mainly to protect the batteries in the event of a fall. Other than that, the safety tech is there to ensure the charging is safe for your devices and you.

RAVPower 12,000mAh Portable Charger


There’s nothing wrong with the reliability that the Zendure A3 portable charger is able to offer with its ability to charge 2 devices at once and enough power capacity to charge smartphones a few times over. With that said, the power bank could be so much better than it currently is.

The charging speed could be faster, as well as the recharge speed. Then there’s the case of the power capacity lowering if charging speed were to increase but that can be solved with better build quality components like Panasonic battery cells.

We think that the reliability meets the acceptable standard at just the right mark but it doesn’t go beyond it at all.

Anker PowerCore 13000 Portable Charger



The Output power capacity is really good but that’s really only because the charging speed isn’t that fast and this results in a more stable conversion.

The charging speed should be faster along with improvements in tech building quality so that the Output power capacity is able to stay the same.


The design of the power bank makes it portable. It surprisingly has small dimensions and is light enough to be held in your hands.


The physical build qualities are the best attributes that Zendure is able to provide with ABS material and a rubber lining that can withstand shock damage so the vital parts of the power bank don’t get damaged.


It’s a reliable enough portable charger but nothing about it goes above. It just meets the standards and that’s why we think that this power bank can go further if it just had more powering capabilities.

More Power Banks with Similar Power Capacities

Specs of the Zendure A3 Portable Charger:

  • Capacity:            Advertised: 10,000mAh            Output Capacity: 7,500mAh
  • Output:   Either Port: 5V/2.1A    Max Output: 5V/2.1A
  • Input: 5V/1.5A Via Micro-USB Input
  • LED Power Indicators: 4 LED Dotted Power Capacity Indicators
  • Size: 3.8 x 2.5 x 1 inches
  • Weight: 7.2 Ounces


Zendure makes good power banks but the thing with being “Good” is that they’re “Good”  and not “Great”. They’re built very well and we actually consider them to be quite the rugged power bank but on the Power side, they could use some work.

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