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Help! UMX MiG-15 battery?

Hey everybody,
I picked up one of the UMX MiG's a while ago and I've been flying it with the stock recommended 2s 280mah lipo, and she flies like a dream, but flight times are a bit short (easily >5 minutes with some fancy flying), I started looking for a higher mah battery, something like a 350 or even higher maybe? Only thing is the compartment on the MiG is a bit small, here's a comparison pic with the 280 next to the compartment;
Anyone know how big of a battery I can go, before I'd have to mod the plane myself? Hoping for something in the 300 range, basically as high as I can go, to get as much flight time outta this as I can