Bettinelli, who made 19 appearances for Stanley before returning to his parent club on Christmas Day, is looking forward to picking up where he left off.
He said: "When I got called back I went in and saw the gaffer and the goalkeeping coach and said that as soon as the other lads got back fit I'd like to get back out.
"I enjoyed playing the games and being at the club and we've got a great team chemistry at the moment and have worked extremely hard to get out of the bottom two.
"I enjoyed my time being back with the Fulham first team and being on the bench but I'm happy to be coming back to play games at Accrington."
Accrington boss James Beattie said: "It's a huge boost to myself and the club.
"Since Marcus initially came in he's been magnificent and he's a very professional young man who I'm delighted to have back at the club."