The Storm 2 Slim is one of the most exciting powerbanks currently on the market. One of the reasons should be clear at first glance, the transparent housing!
So you can see all the components of the Storm 2 Slim, the battery cells, etc. directly.
But not only that, also technically the powerbank is very exciting! So this has 20000 mAh, a 100W USB C port, as well as a practical display.
Cool! But how does it look in practice? Is the SHAREGEEK Storm 2 Slim really worth 200€?
Let’s find out in the test!
Case and dimensions of the SHAREGEEK Storm 2 Slim
The most striking thing about the Storm 2 Slim is the case. Apart from the metal end pieces, it is completely made of transparent plastic.
This gives you a clear view of both the electronics, which are located on the top, and the battery cells in the lower area. The cells are 4x 21700 cells.
Thus, the name “Slim” is quite appropriate, because for 20000 mAh the powerbank is quite compact!
On the top of the powerbank is a button, as well as a small color LCD display.
The display of the Storm 2 Slim can show you the following information:
- Capacity in %
- Voltage of the internal battery cells
- Input power (watts, volts and amps)
- Output power (watts, volts, amps)
- Temperature battery cells
- Temperature Controller
- Voltage of the four battery cells
- Last measured capacity
- Cycles
- Battery durability in %.
At the same time the display is also visually really nicely done!
Connections
The Storm 2 Slim has one USB C port and one USB A port.
USB C – USB PD – 100W 5V/3A, 9V/3A, 12V/3A, 15V/3A or 20V/5A
USB A – Quick Charge – 30W 5V/3A, 9V/3A, 12V/2.5A
The most exciting part is, of course, the USB C port. This has an output power of up to 100W! This makes this powerbank fully suitable for large devices such as notebooks, etc.
The powerbank is also charged via the USB C port, but “only” with up to 65W, which is also very impressive for such a small powerbank.
The additional USB A port is supposed to provide up to 30W according to Quick Charge.
Supports the PPS standard
The Storm 2 Slim also supports the PPS charging standard. Here, the powerbank offers a range of 3 to 21V at up to 5A.
So we have the full PPS range! Thus, the powerbank is also wonderfully suitable for Samsung’s S23 Ultra, which could charge with the full up to 45W at the powerbank.
What is the real capacity of the Storm 2 Slim?
SHAREGEEK advertises the Storm 2 Slim as having a capacity of 20000 mAh or 72Wh. Here’s what I was able to measure:
| Wh | mAh | % der HA | |
| 5V/1A | 52.52 | 14195 | 71% |
| 9V/1A | 58.087 | 15699 | 78% |
| 9V/3A | 60.062 | 16233 | 81% |
| 20V/1A | 59.777 | 16156 | 81% |
| 20V/3A | 58.433 | 15793 | 79% |
| 20V/5A | 55.278 | 14940 | 75% |
Unfortunately, the practical results are somewhat mixed. As with many high-end powerbanks, the real capacity is somewhat lower.
Thus, I could measure a capacity of up to 16233 mAh or 60.062 Wh in the best case. This corresponds to around 81% of the manufacturer’s specification, an acceptable value.
In the “worst case” at a load of 5V/1A, the capacity was only 14195 mAh or 52.52 Wh, which is only 71% of the manufacturer’s specification.
A hot powerbank (in the truest sense of the word)
Unfortunately, the output power of 100W is a bit optimistic. Yes the Storm 2 Slim can deliver 100W, but if you discharge it constantly at an even 100W, then this will temporarily shut down at about 40% remaining capacity due to over temperature.
60W on the other hand can be supplied constantly. Therefore, my tip, use the power bank simply constantly with a “up to 3A” USB C cable, so this is artificially limited to 60W and not overheated.
It also gets hot when charging the powerbank
Most of the time, charging is more stressful for batteries than discharging. So it’s no surprise that SHAREGEEK has limited the charging of the Storm 2 Slim to 65W to reduce temperature issues somewhat.
However, this was only partially successful in my test. Thus, a charging process of the powerbank worked completely continuously with just over 60W. Here, the powerbank was filled from 0% to 100% in just 1:30h, which is extremely fast!
However, we can see a short temperature-related pause during a second charging run. This caused the charging to take 1:40h, which is still very fast!
Conclusion of the Storm 2 Slim
The Storm 2 Slim is a super cool or should I say hot powerbank? I find the transparent design of this simply very appealing!
Also the technical features are top with 20000mAh, 100W USB C port and 3-21V/5A PPS level! Add to that the useful display and we have one of the best powerbanks in its class on paper.
This is great for smartphones like the Samsung Galaxy S23 Ultra (which can be charged at full speed thanks to PPS), as well as iPhones and of course notebooks!
In practice, this is also a very good powerbank, but there are definitely two weaknesses here.
- The real capacity is less impressive with up to 16233 mAh.
- The powerbank can have temperature problems
First, the capacity of the powerbank is ok in practice, but also not “gigantic”. I could measure between 14195 and 16233 mAh here.
In addition, the powerbank can shut down due to overtemperature when constantly discharging 100W. Too bad! However, this is not a disaster in practice.
So I would recommend the powerbank primarily for medium-sized notebooks (MacBook Pro 13, Dell XPS 13, etc.) or large smartphones (S23 Ultra).
