i know that mostly problem of all user UFC combo and UFC v2 is the clip in supply of
RED,
BLACK,
GREEN wire loose after clip. her my solution hope you like....
1st i get a one batterry not uses of 7210s, i cut out the pin interface of battery
2nd i resolder 3 wire in interface pin battery then i connect again the 3 wire UFC interface pin of POSITIVE,GRND,BSI
3rd, just look this
4rth this final result