I also have Helifar H803.
It's fun to play indoor. But short battery life. About 6 min max.
What happens to the Z5? You busted it?
P.S. If you have a large indoor space, Z5 can be flown indoor WITHOUT GPS.
The Z5 is doing great. I love that thing!!! Beautiful still shots and the video is good too when it's not very windy. I finally started going high with it 110 meters and 200+ meters distance. Can't even see it any more but when it gets to about 250 it says it loses contact and the drone comes on back.
I also want to play around with little very cheap stuff and also indoor flying. I've never had anything that was good for that, but have had a couple of things that suck for it. A guy I work with said that a 3.7V 600mAh batter will work if it will fit in the Helifar which comes with a 330mAh. I intend to try that out asap after getting it. If you want to try it too the best deal I've seen on those batteries so far is:
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The plugs look like they will fit. He said 25C is the discharge rating but I asked him about that (thinking it might be the plug type) and he didn't say anything more about it than what it means so I'm guessing that part won't be an issue. If you try it before I do please let me know how it goes. I should get the drone on Friday and extra batteries by the 18th.