It's quite a rock that GreyLime throws with their Power Stone 10,400 mAh powerbank with two USB connectors for iPhone and iPad.

The multiple test winner, who has been swiped to the top of the powerbank list by several major Danish media, is also a very good bet for a power bank that can meet the needs of most users in everyday life – and a little more. 

The GreyLime Power Stone 10,400 mAh power bank has a charging power output of up to 10W, spread over 5V 1A and 5V 2A, allowing you to charge two mobile devices at the same time. In addition to the two USB 2.0 ports, the power bank also has a USB microplug that comes with it.

Its capacity makes the Power Stone 10,400 mAh powerbank suitable for charging most mobile devices, whether it's the iPhone or various Android brands like Samsung, Huawei, Nokia or Sony.

The large battery stone takes barely four hours to fully fill up with power. When it is full, the four LED level indicators will light up. The number of LED level indicators will also always show you how much power is left on your GreyLime Power Stone 10,400 mAh powerbank.

Then there are just over 4.6 full charges of, for example, an iPhone 8. So even if you're charging two cell phones at the same time, there's still another charge of these without draining your Power Stone completely.

GreyLime Power Stone 10,400 mAh power bank comes in three different colors. It comes in either grey, dark blue or sand.