So I don't have all the necessary measuring equipment to do this reply a robust justice. I only have cheap mechanical kitchen scales and observation.
This does as you say depend on the socket. Well used plugs like in hotels and airports are where you tend to be traveling and tend to be more sensitive to access to power, and that is where the problem exists. It is so bad that I often have to use a Powerport4 with a cord, or carry an extension cable, to make the weight on the wall as little as possible.
There is also airplane seat sockets, they have a little spring in them to push out plugs.
My Fusion is an EDC in the home-office day, it is compact and simpler than a charger+cable+battery. It is not for traveling with where the plugs are of on average lower strength.
I also actually think the Fusion 5000 can be improved upon. Given it is only 5000mah, it should be lighter.
On kitchen scales it is 6.5oz, the battery inside it (26650) is 3oz, so the other 3.5z is packaging and 10.5W charger. The Powerport2 24W is 3.2oz, the Aukey 12W is 1oz. So I reckon with product refinement it can be made smaller and lighter. The size matters in that is has a long length pulling off the wall, and the bulk of the weight is the battery and it is placed also pulling away from the wall, so the CoG of the Fusion is about half its depth. That could be designed much better with either the shape being flush (but then it restricts the places it can be plugged, accepted trade-off) or the battery kept up against the side with the pins to pull the CoG nearer.
So the issue is then 2-fold:
- you can see how it can be improved, therefore probably it will be improved therefore you may well buy it now and kick yourself when the better version emerges
- it does actually pull itself out of worn sockets in hotels in particular.
I think its good for an EDC in more benign situations, for that I own it and it goes in my EDC bag.
Shown is a 5000mah battery, a 12W charger, and the Fusion next to each other. Do you spot the opportunity for improvement? Lithium Polymer can be made in almost any shape. So you could make more of a product which is say the same vertical height but less depth from wall so shortening CoG so tend to pull out of weaker sockets less easily.
BTW that 12W charger cost me $6, the battery is worth say $2-$5 depending on quality.
i bought the Fusion at $20.