BlueBuilt Power Bank 10,000mAh with Fast Charging 30W

Can power my recent, powerful laptop for about 3 (power-hungry) to 6 hours (average).

The form factor is a bit of a brick, which can stand flat or on its back, and has a handy display that shows how much power is going out of or into each port.

Specs say 140W: I managed to get up to 100W from 1 port, which was also pretty much the maximum my laptop draws; this was possible without the pack getting very hot. With standard use, this adds something like 5 hours of runtime to a power-hungry (20W) laptop.

I am not sure if the 140W is a maximum of 100W per port or total per port, but I also haven't found a power-hungry enough device that can draw 140W. In any case, this pack would last a maximum of 45 minutes.

All in all, a solid pack that can ensure my laptop lasts a good workday.

I don't find reviews like "Works well" and "Can charge my phone often" very useful. That is why I decided to really put the power bank to the test, using a USB tester and an electronic load.

The power banks have now been charged and discharged three times, and I can report that these power banks compete with the A-brands when it comes to achieving the promised capacity, as well as the promised output.

If you drain the power bank at a rate of 100W, you get about 85-88Wh out of the 99.9Wh in the cells. The fact that this power bank consistently delivers 100W from 100 to 0 percent is an achievement in itself, but the efficiency with which it does so is truly above expectations for a house brand power bank.

With a somewhat more realistic load of ~45W, you squeeze 91-93Wh out of these guys. That is more than 90% efficient; perfectly fine. I bought the Duo Pack; they performed within 2-3% of each other, which is otherwise normal.

Really the only thing I have to comment on: next time, please include a 100W/140W (5A/28V with E-marker) cable instead of a 60W cable. The power bank cannot be charged at full speed with the included cable.

I bought this power bank to film or take photos outside the car with my dashcam.

Contrary to what Coolblue claims about it not fitting in your pocket, the device fits perfectly in your pocket.

Unless you are a resident of Madurodam; in that case, no, it won't fit in your pocket.

I myself am not from Madurodam; I am a real person and have no problem with it.

Moreover, the product charges quickly.

It comes with a 3-year warranty.