Woah! The photo shows the manual saying 143x47x31. My 3Ss won't fit either. It's the width that's the problem, even my 2S won't fit!! not many batteries that thin (47mm), either 2s or 3s... :/

Lemme have a look on HK... Hm...scary. HK doesn't have a single 3s battery less than 49mm width. :/