So let’s get to the main story. ASUS ZenPower has a capacity of 9600mAh, which is stored at 3.75V. Take note that when the power bank charges your devices, the voltage will be stepped up to 5V. So the maximum output you will get is: 9600mAh x 3.75V/5V = 7,200mAh. However, this value is not the actual output value you will get as there will be some energy loss during the conversion and the charging process. The official number given by ASUS is 6510mAh, so the efficiency will be around 90.4%. I have tried to charge the ZenFone 2 with the ZenPower and on average it can charge the phone for 2.2 cycles. The ZenFone 2 has a 3,000mAh battery so I can get around 6,600mAh worth of charge. This means that the number given by ASUS is valid.
The maximum rated output current is 2.4A, which is higher than most power banks with output current at 2A. The output current is even larger than most chargers we have so you can expect shorter charging time. Of course, the 2.4A charging current can only be achieved if your device can support that much current and the USB cable you are using does not have high resistance.
Worried that the 2.4A current will damage your device? You can throw away that thought. ASUS has implemented 11 types of protection on the ZenPower to protect your device, your charger and of course the ZenPower itself. I have no ways to test these features myself but ASUS has 6 international safety certifications to back them up, so I guess you and your devices will be safe as long as you get an original unit.
The ASUS ZenPower supports bypass charging, which means that it can receive and output charges simultaneously through two of its ports. However, as the position of the two ports are very close, you will have trouble inserting two cables into both ports if the ends of your cables are too thick. I guess this is the price to pay for having such a compact footprint.
We have a lot of good choices in the power bank market. Luckily, ASUS ZenPower does have a few standout features. First of all, it is really affordable. Coming in only RM59 each, you probably can’t go wrong with it. Next, it supports 2.4A fast charging, which is uncommon among budget power banks or even other pricier options. It is also one of the smallest power banks, albeit not any thinner, as compared to other choices with similar capacity.
Combining these features with a good built quality and a nice design, I have no trouble recommending the ASUS 9600mAh ZenPower at all. Of course the Xiaomi’s 10400mAh Mi Power Bank is another solid option you can consider and you can click here to read our comparison between the two. So coming back to our question at the very beginning, is there any sacrifices or risk to use such a cheap power bank? My answer is no and I would ask you this question: “Why pay more?”
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