Mobula 7 1S ultralight TPU battery strap

Got a lightly used Mobula7 1s ELRS version with 8 BetaFPV 450mah batteries BT2.0 connector for a deal. Flew it about 8 times using the battery lead in tensions (connector at the front) to keep the battery from coming out but a high speed asphalt landing took out the battery leads. 

Looked for a light TPU strap and didn't find one that I liked. With a 0.6 mm I need Archane slicing to make the then 0.5mm wide lines which are holding up just fine.

Simply loop it under the battery tray area, front to back, and feed the battery through the 1st strap hole, the frame battery tray, then the 2nd strap hole. the light tensions keeps the battery plenty secure, even for a pretty good cartwheel crash landing.