Do you want a 2s 65mm "whoop"?
I made a 2s 300-350mah battery holder to fit a 65mm frame, you need to cut away the old 1s holder.
I did not turn the battery on it's side as it just starts to hang too low at that point.
It works with beta65 pro and ur65 frames nicely. (those are the only ones I have to test against.)
Designed to be printed out of TPU.
I printed at 0.15mm, you don't need support for the actual holder as the hanging area is so small but some support from build plate only for the mounting part helps, infill doesn't matter.
To use, cut the 1s built in holder off and pop it onto the two cross bars.
weighs 1.2 grams.