if the battery fits, i don't see why there would be any problem hiding it in there if you're going pods. my concerns would be mounting it inside the airbox so it isn't loose, and then fabbing up some sort of cap for the stock airbox holes just for aesthetics...
I like this idea - I too think that the airheads look a little weird without something finishing off that airbox area.
1978 BMW R80/7
"all we need is time and courage." - Renner
"A lightened flywheel on your bike is like me getting into Spandex and putting on track shoes to walk the dog." - M