The file 'QAV 250 Battery Clamp 3D Printer Model' is (stl) file type, size is 57.1KB.
I had problems with fixing my battery on my QAV 250 drone.So I designed a lightweight battery clamp.
I used a Turnigy nano-tech 1500mAh Battery.
You can use the default screws from the Zmr 250.
I used this frame:http://de.aliexpress.com/item/Free-Shipping-New-QAV250-Carbon-Fiber-Mini-250-FPV-Quadcopter-Frame/1963567295.html?spm=2114.010208.3.20.fOpXQT&ws_ab_test=searchweb201556_10,searchweb201602_5_10057_10056_10065_10037_10055_10054_10069_301_10059_10033_10058_10032_10017_10070_10060_10061_10052_10062_10053_10050_10051,searchweb201603_9&btsid=bb339b9b-bcb2-4b84-9ea8-8f3ac132c836