I'm using Gm racing (graupner) lipo 4200mah with hard case . I think that's the biggest you can get because the rear pack I have to squeeze it a bit to fit (I you look at your rb5 at the rear of your battery slot there's two sort of protrusion for screw to be put from the bottom of the chassis ).
The specs Dimensions (L x W x H) approx. 2 off 69 x 47 x 23.5 mm
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