Hmmm, thinks!
I have re-read your first post, and whilst power seems low, you do not say if it actually cut out. If it kept going without cutting out, and seeing your battery voltage seems ok, it would suggest the problem is elsewhere.
Two things come to mind. If you are using the bike in pedelec mode, you must ensure the throttle button is not depressed. It's easy to press it without noticing. This has the effect of reducing the power available, so make sure the button is out. Is there any difference when using the throttle with the pedelec bit switched off? You need to press the minus button on the handlebar controller three times until all the power lights go out, leaving only the battery meter lights remaining, then use the throttle.
Secondly, and perhaps the more likely issue is with the controller that sits in the box at the bottom of the seat post. My controller failed progressively over a period of a few weeks earlier this year. In my case I was experiencing intermittent complete failures, often remedied by switching off at the key, and back on again. A new controller (£65 as I recall) sorted it completely.
It may be that your controller is stuck in low power mode and this might explain the fact that your battery appears fine but only low power is available. I'm afraid I don't know how to check it, D8Veh is the man for that.
If you haven't already, do give Freego a call and ask for their technical guy. I did, and found them helpful and constructive, and the guy knew the bike in great detail.
Good luck with it, they are cracking bikes, when its all working right, mine still goes really well.
