Bought a good 4 amps 43.5 volt charger for my 36 volt 12s lithium battery pack. It only came with the XLR cable. So, with some help from google and the community at endless-sphere.com I fabricated this adapter, from an adapter designed for audio:
The audio adapter was wired for audio, so I rewired it this way, thanks to google and especially jkaness at endless-sphere.com:
Works beautifully and 4 amps is quick charging! Pretty cool. Feels like an upgrade.