Bests & Worsts Reviews from Amazon

I am giving this 5 star because the product is as advertised and some of the negative views I see are somewhat unfair. The item is a merger of two functions, of storing energy and being a wall charger, and like all merging, it has to move to a compromise of moving from doing 1 thing well to 2 things less well, and that in no way makes it a worse product, but means you need a specific situation for this to be the right answer to your problem. On receipt I stress-tested my unit for it to be physically working, and to work as claimed, which it passed. It is the Watt claimed and mah claimed. I used a OnePlus2 drained battery phone turned off and recharged it to 100% and there was a little bit of Fusion battery left which tallies with 5000mah (3.7V / 5V = 0.74, and 0.74 x 5000 = 3700, so allowing for 10% energy loss = 3330mah and the OnePlus2 is 3000mah so I'd expect 1.1 recharges). Some reviewers don't realise you cannot use Mah vs Mah as the volts are different. The Amp output is true, I used a USB meter and when attaching a sufficiently hungry draining device I got 2.1A, about 5.2V and 10.9W so a little over the stated maximum. Where this product fits is where you basically want simplicity of a wall charger with a bit of portable power, so more for a EDC in a typical working day type situation of charge phone/tablet when near wall power and a bit of top-up portable power if you're busy on the device and moving. Where this product does not fit is if you're really power hungry, in that it is only a 10.5W output wall charger so cannot recharge 2 large devices quickly, and it is only 5000mah so it cannot recharge large devices (or small devices multiple times). If you are carrying large devices (tablets usually) then you're likely wanting to make more speedy ingest time when at wall socker with a higher Wattage wall charger, and if you have a long time moving away from wall socket then likely a larger mah battery. As a battery it is huge, it is bigger than a 10000mah with only 5000mah. As a wall socket charger it is huge, 10.5W in a huge device. But if you are carrying now a small wall socket charger and a small USB battery, this is a combined smaller simpler solution. So this is more a top-up EDC for a typical day with your phone situation.