50 mah pack is used for HL gliders and 010 models. At least thats what I use mine for.

Warning on the use of LIPOs with regulators. Nothing wrong with the LIPOs BUT two of my clubmates have had crashes that we can trace to inexpensive regulators. It appears the REGULATORS WERE SLOW TO REACT TO LOAD VARIATIONS AND THIS LED TO A FAILSAFE and crashs.

RX packs are so cheap now I would just buy a 4 cell nimh or nicad.