Dean:
I have the Hirobo which uses a much smaller batt. but get 10 to 15 mins, depending on how hard I push it. These are 720 ma. But I have TP 1320 batts that I use in planes. That would be about the right size and would work on your charger. After getting a long run in the foamies I put back in 1226 ma. on the charger and they weren't run all the way down.