Repurpose RAD battery as emergency power source

[eCouleeRider]

I think I may have found a five pin plug that will fit the battery discharge port. (See two attached images.)
Does anyone have experience using this adapter on a Rad battery?
BTW - I now see that the polarity is clearly indicated on the Rad battery.

I am leaning towards this type of solution rather than going through the charging port or USB port on the display.

 

[RangerDave]

Does anyone know what the 3 small pins operate, if anything?

Thanks! - RangerDave