A couple reviews mentioned the boat sinks if the lid is lost on a flip, so I filled both mine with pool noodles. Interesting fact to mention, if you look at the specs for the original Joysway Alpha 1000, under requirements is lists hull flotation needed. LoL.

Anyway, I'm a little confused on the battery specs shown in post 7 with recommmended measurements (144x51x27mm). The length of the battery trays certainly is not an issue, they are very long. The width doesn't seem to be an issue either. The height would be a limiting factor, but remains to be determined what the max may be. I saw the post showing 27mm tall max. I just test fit a 36mm tall 3s battery and seemed to have a bit of room to spare, as it was still sitting on top of the velcro strips. Have they changed something with the battery tray positioning to allow more room? Hopefully? Maybe they have moved them more towards the center/bottom of the hull...