A render of what the iPhone Fold could look like - Image Credit: AppleInsiderCode references in the iOS 27 developer betas mention an iPhone using multiple batteries. This could be related to the iPhone Fold, but it may have a more pedestrian explanation. For inbound devices like the iPhone Fold, they can sometimes point to big changes in the design. According to an examination of the just-released fourth developer beta of iOS 27, MacWorld believes this is a sign that an iPhone with multiple internal batteries is on the way. This is also not the first time we have heard of the iPhone Fold using multiple batteries.