Hi, I recently bought a radio that runs the tx lipo battery packs, and I have never charged those before. The battery it comes with is the reedy 1350 mah 3s receiver pack. The thing I am trying to figure out is which connector do I use to charge it with? There is the black and red skinny connector, and then the 4 prong connector that you plug into the receiver for the power.

I am charging these with the onyx 230 charger, and I have the deans connector hooked up to the banana plugs, what kind of plug will I need to charge these with? Thanks for the help, as these receiver packs are rather new to me lol.