Today, I have been going through my logbook covering details of all my flight times over the last 3 and a third years (since I got my TH) looking for any trends that I can identify...how my flight times have been declining over time. All my Power 4 batteries (the Yuneec brand) have shown a decline in performance over that time but they all show consistency when viewed alongside the respective weather data: Cold windy days I get less...warm and still days I get more. But, on average, I can see a steady decline which is to be expected as they age. The point is that the decline has been steady...no sudden surprises. I can't point to any time during that 3 and a bit years where I can see a sudden noticeable change...no sudden downward step change.
My conclusion is that if nothing else, Power 4 batteries are predicable as far as these sorts of batteries can be predictable. I do not have anything like the comprehensive data relating to any other battery brand targeted at the TH as I do with Power 4 batteries (I do have similar data for the Phantom 2 smart batteries but that is an entirely different battery design) since I have only 3 flights on record so far using the Gifi battery. I like my Gifi battery and, so far, it is performing well. But I don't have any historical data to show that Gifi perform any better or worse than Power 4 batteries. So far, my new gifi is performing at least as good as I have ever seen from my Power 4's...but will that last? Will it go tits up on it's tenth flight? I have no idea.
Better the devil I know???