Archive for the ‘Mobile USB Power Banks’ Category

The 4000 mAh ASUS ZenPower Slim Power Bank (ABTU015) is a very slim, compact and stylish device for charging your smartphone or other mobile devices on the go from Asus. The 4000 mAh battery is inside a plastic case with a larger matte and smaller glossy surface and that looks pretty nice, however the glossy plastic scratches very easy when touched and very soon it does not look that good anymore. The device also has a single white LED disode that provides “flashlight” functionality that in our opinion is totally useless and the power bank could’ve been better without it anyway. There is an on/off button (used for the flashlight as well) and a small three-LED indicator about the current power bank charge that looks nice and is quite useful. The compact size and weight make the ASUS ZenPower Slim Power Bank perfect to sit in your pocket and save you whenever you need some extra power and cannot use a power charger for your smartphone or other mobile USB gadget and without the glossy plastic part and the LED light it could’ve been a really great small capacity power bank. Do note that ASUS also offers a version of this portable power bank with a smaller 3000 mAh capacity that is apparently with the same specifications as the 4000 mAh version we are testing here, apart from the 1000 mAh lower capacity battery inside it of course.

4000 mAh ASUS ZenPower Slim Power Bank Specifications:
– Battery Type: Rechargeable Li-Polymer Cell
– Battery Capacity: 3.85V/4000 mAh
– Input Power: 5V/1A
– Output Power: 5.1A/1A
– Rating Capacity: 5.1V/2200mAh
– Charging Time: <6 hours with DV 5V/1A standard cable - Dimensions: 115 x 71 x 8.3 mm - Weight: 92 g

We need to see how well the ASUS ZenPower Slim Power Bank manages to perform under our test conditions with a constant current load of 1.0A as per its official rating in order to get a better idea on what to expect in terms of actual usable capacity. In the official specifications Asus rates the useful capacity at 2200 mAh. This was something that we were actually a bit surprised to see mentioned in the official specifications for a power bank as usually manufacturers do not cite these cumbers in their product’s specs. The 2200 mAh rating sounds a bit disappointing for a 4000 mAh battery inside the power bank, but our tests have shown that you will actually be getting more… We managed to get 2574 mAh or 12.11 Wh as usable capacity and that is actually what we consider a very good performance, though the output voltage was a bit lower at about 4.7V, but keeping stable at that value. So good job for Asus for this power bank, but it could’ve been even better without the extra glossiness that easily scratches and the useless LED light “flashlight”.

The performance of the 4000 mAh ASUS ZenPower Slim Power Bank in our tests:

– 2574 mAh at 1.0A load

– 12.11 Wh at 1.0A load

The company GP Batteries is a pretty old and popular name when talking about batteries, but they also started making power banks with the advent of this new product category and they already have a umber of products available. Here we are testing one of their smaller capacity models – the 5000 mAh GP Portable Power Bank (FP05M) that looks and feels nice in terms of design and functionality and specs wise seems promising. It has an aluminum body, a convenient LED indicator for remaining capacity and support for 2.0A charging input and 2.1A charging output.

5000 mAh GP Portable Power Bank (FP05M) Specifications:
– Battery Type: Li-Polymer battery 3.7V 5000mAh
– Input current: 2A
– Output current: 2.1A
– Number of outputs: 1
– Size: 120 x 66 x 13 mm
– Weight: 165 grams (approx.)
– Operation Temperature: 5C ~ 40C
– Recharging time: 5 hours (approx.)

With the 5000 mAh GP Portable Power Bank (FP05M) we have performed our usual 1.0A and 2.1A constant current load tests and you can see the results on the discharge graph above. It is interesting to note the interesting jagged pattern of the discharge cure for both currents we have tested with the electronics of the power bank apparently trying to keep the output voltage closer to the 5V, so the output Wattage would not drop more even though the mAh capacity might still seem higher as we have seen on some other products. We are seeing good results under 1.0A and especially good under 2.1A load for a 5000 mAh power bank, so good job for GP Batteries for this device.

The performance of the 5000 mAh GP Portable Power Bank in our tests:

– 3023 mAh at 1.0A load
– 2896 mAh at 2.1A load

– 15.05 Wh at 1.0A load
– 14.02 Wh at 2.1A load

The 6000 mAh Fresh’n’Rebel Power Bank is an interesting device that comes with a cool looking design, LED indicator for the battery charge and even though the capacity of the battery inside is not that big it supports high output current. One of the most interesting features of this product is specifically the 5V / 2.4A input and output supported by the device, meaning that it can be charged faster and can charge faster devices supporting higher current charge. What we only need to consider it good product is a good performance delivered by it and everything should be just fine for this power bank.

6000 mAh Fresh’n’Rebel Power Bank Specifications:
– Battery capacity: 6000 mAh
– Input: 5V / 2.4A
– Output 5V / 2.4A
– Charging time: 6 hrs with 5V/1A input
– Size: 95x52x25mm
– Weight: 140g

With the 6000 mAh Fresh’n’Rebel Power Bank (2PB2000CL) we have performed our usual 1.0A and a 2.4A constant current discharge tests and the results look very good in terms of stable and high voltage across the board. The discharge curves do look interesting as there are small “waves” for the voltage fluctuating slightly, but keeping relatively stable at around 5V for 1.0A and 4.9V for 2.4A constant current loads. The resulting available capacity with 1A discharge current is very good, though at the 2.4A test the usable capacity seems a bit disappointing with a short of 50% available mAh capacity as output from the power bank from the 6000 mAh battery inside the device. Still Fresh’n’Rebel did a very good job with the electronics of the power bank, maybe the battery cells used inside could be improved a bit for higher current output situations to make the device even better.

The performance of the 6000 mAh Fresh’n’Rebel Power Bank in our tests:

– 4074 mAh at 1.0A load
– 2859 mAh at 2.4A load

– 20.34 Wh at 1.0A load
– 14.04 Wh at 2.4A load