[cctalk] IBM 5155

I just managed to score a 5155. Well, soon, it is waiting for me to pick it up at the University where I used to work. It looks to be in really good shape and has been in storage for probably two decades or more. A couple quick question for anyone familiar with this system. Is it likely there is one of those little batteries on it that would now be dead and need replacing before I try to use it? And, also, would this have a floppy controller on it that was capable of reading and writing disks from systems like the TRS-80 with an SD boot track? Inquiring minds want to know. :-) bill