The 20000M features two USB ports and offers very fast, efficient charging.
It offers many color options.
It doesn’t take much time to charge the 10,000mAh internal battery.
It is slightly bigger than the Xiaomi portable charger.
The maximum output of the two USB ports is only 5V-2.1A.
No fancy features such as an LED torch.
The bottom line
The Cube 20000M looks great and works well, and is reasonably priced. It is one of the best choices out there if you don’t mind slightly less portability than the Xiaomi charger.
The 20000M is a newly released portable charger by Cube, a brand mainly known for making affordable tablets and computers. But Cube is no stranger to the crowded mobile charger market, instead it has released quite a number of models in the past few years, but none of them proved to be a major hit.
Looking at the name of the portable charger, you might think that it has 20,000mAh battery capacity, but it actually has only 10,000mAh battery under the hood. Since Cube has a history of confusing people with its product naming (the Cube i7 convertible is actually powered by a Core-M processor), customers should really be careful when buying their products.
Inside the box, you will find a battery pack, a charging cable which could charge the battery pack and the internal battery, an instruction manual and a warranty card. Unfortunately the 20000M doesn’t come with a wall charger, so you will have to use the wall charger of your smartphone or your tablet to charge this portable charger.
The Cube 20000M’s design is very refreshing. It has a typical rectangular shape, but without the rounded corners normally seen on other portable chargers. The overall footprint of the 20000M is slightly bigger than most of the mobile chargers with the same level of power capacity, but it is also slightly thinner and feels less porky in your hand.
What really make the Cube 20000M’s design special are the 4 color options it offers: blue, orange, silver and green. My review unit is blue, but only half of the shell is covered in blue, and the other half is covered in black. The same design philosophy also applies to other color options, while black always occupies the rear and half of the sides.
There are two USB output ports and a Micro USB charging port on the left side of the 20000M, and there is also a power button on the rear, but I didn’t find much use for it, as the charging will start automatically after connecting your tablet or phone to the portable charger. There are four LED lights between the two USB output ports, indicating the remaining power level of the internal battery.
As mentioned above, the Cube 20000M features 10,000mAh internal battery, which is average among high-end portable chargers. In theory, when fully charged, the 20000M has a total output of 5V-7,400mAh battery and can charge your smartphone multiple times as most smartphones only have a battery smaller than 3,000mAh.
I tested the 20000M’s charging performance with my Samsung Galaxy S7 Edge, iPad Air 2, Samsung Galaxy Tab Pro 2, LG G3 and LG G Pro 2, and I have to say that the 20000M works as designed. It didn’t really outperform the other battery packs I had used, nor did it fall short.
Charging the Samsung Galaxy S7 Edge (3,600mAh battery) to test the output capacity:
I started the Samsung Galaxy S7 Edge at 15% and the 20000M at a full charge.
*10 minutes the S7 Edge at 23% and the 20000M at 4 LEDs.
*20 minutes the S7 Edge at 32% and the 20000M at 4 LEDs
*30 minutes the S7 Edge at 40% and the 20000M at 4 LEDs
*40 minutes the S7 Edge at 47% and the 20000M at 4 LEDs
*50 minutes the S7 Edge at 54% and the 20000M at 3 LEDs
*60 minutes the S7 Edge at 62% and the 20000M at 3 LEDs
*70 minutes the S7 Edge at 70% and the 20000M at 3 LEDs
*80 minutes the S7 Edge at 77% and the 20000M at 3 LEDs
*90 minutes the S7 Edge at 85% and the 20000M at 2 LEDs
*100 minutes the S7 Edge at 91% and the 20000M at 2 LEDs
*110 minutes the S7 Edge at 97% and the 20000M at 2 LEDs
*120 minutes the S7 Edge at 100% and the 20000M at 2 LEDs
Then I started charging the LG G Pro2 (3,200mAh battery) at 4% with the 20000M after finishing charging the S7 Edge.
*10 minutes the G Pro 2 at 13% and the 20000M at 2 LEDs.
*20 minutes the G Pro 2 at 22% and the 20000M at 2 LEDs
*30 minutes the G Pro 2 at 30% and the 20000M at 2 LEDs
*40 minutes the G Pro 2 at 39% and the 20000M at 2 LEDs
*50 minutes the G Pro 2 at 48% and the 20000M at 2 LEDs
*60 minutes the G Pro 2 at 60% and the 20000M at 1 LED
*70 minutes the G Pro 2 at 70% and the 20000M at 1 LED
*80 minutes the G Pro 2 at 78% and the 20000M at 1 LED
*90 minutes the G Pro 2 at 85% and the 20000M at 1 LED
*100 minutes the G Pro 2 at 89% and the 20000M died.
Both of the above tests are done with the smartphones turned off.
I also tested charging the iPad Air 2 (7,340mAh battery) at 17% with the 20000M when it is fully recharged. This time around I left the iPad on as I needed to see the percentage of the battery.
*30 minutes the IPad Air 2 at 28% and the 20000M at 4 LEDs.
*60 minutes the IPad Air 2 at 40% and the 20000M at 3 LEDs
*90 minutes the IPad Air 2 at 51% and the 20000M at 3 LEDs
*120 minutes the IPad Air 2 at 60% and the 20000M at 2 LEDs
*150 minutes the IPad Air 2 at 69% and the 20000M at 2 LEDs
*180 minutes the IPad Air 2 at 77% and the 20000M at 1 LED
*210 minutes the IPad Air 2 at 85% and the 20000M at 1 LED
*240 minutes the IPad Air 2 at 87% and the 20000M died
It is not hard to tell that the losses in the charging circuit of the 20000M is less than 20%. The Xiaomi portable charger (10,000mAh) I tested last year got a similar result.
In real life use, when the internal battery is fully charged, the 20000M has no problem charging your iPhone and average Android smartphone several times. It should also be able to charge your dead iPad to a point where you could have another 5-7 hours of screen time.
Although the 20000M has 2 USB output ports and can charge two devices simultaneously, limited by the 2.1A maximum output, the charging will be significantly slower than when there is only one device connected.
The Cube 20000M is priced at RMB79 ($12) in China, and in this price range you do have lots of options. But most of the portable chargers only come with one USB output port, and very few of them actually look fashionable. The Xiaomi charger, which is also priced at RMB79 ($12) and offers the same battery capacity, is slightly more compact, but only offers one USB output port. The Aigo portable charger is slightly cheaper at RMB77 ($11.7), and it also offers 10,000mAh internal battery and two USB output ports, but there’s nothing new about its design. The Space M20000, which is priced at RMB79.9 (12.1) offers 20,000mAh internal battery, two USB output ports, an LED torch function and a refreshing design, but doesn’t give the customers many choices in colors, and you might need to be little bit more cautious picking a product from a brand that is rarely heard of. The list goes on and on, and we can only name a few here.
The 20000M portable charger is good-looking, reasonably priced and works as designed. It doesn’t offer extra features and value when compared with similarly priced competitions. However, in a world filled with cold, plain-looking gadgets, the colorful Cube 20000M does feel like a breath of fresh air and has the potential of becoming a serious contender in the crowded market of portable chargers.