You should be fine without the battery. Aggro has a cleaver way around it.
I would also recommend not mounting it directly on the mb. For years I was a purist, and only installed the green barrel oem's that weren't suppost to leak.. The stock of these is getting quite poor and may leak if the owner puts it in storage for years.
I'm now in the phone battery club. Would love to see other handy work here. I'm thinking of mounting in the hard drive bay and hooking up a disconnect. Anyone try this?