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