Most lipo's up to 4000MAH hardcase will fit without major mods.
Up to 5000MAH you will need to space the top deck about 2 mm.
In both cases you need to dremel a bit of the front middle axle holder and of the side belt tensioner(where the lipo hit's it).
Above 5000MAH you need to space the top deck 4 mm.
Regards Roy
Originally Posted by
Jochim_18
Height of the batteries should not be more than 23mm this is standard 2S hard case lipo packs.