Published by George & Peter,
Since we have assembled the major parts, and have very general instructions for you attached.
Here's some of our flight videos for your reference.
For sure, you could use a Lipo 2S or 3S 800mAh 30C to fit into the fuselage.
The CG is located ~ 33% of the wing width from the front edge.
The BL motor come with this glider do have a kv ~ 3000, and we suggest to use 2S Lipo with 850mAh, ~ 35C.
Some people use 3S, ~700mAh, 40C, for more powerful flying...
See some people even use AAA batteries here : https://www.rcgroups.com/forums/showthread.php?1620801-Speedo-Battery