I think you have plenty of options for built in battery if you're looking for 30 watts (several DNA30 devices out there fit the bill), but everything higher that's out right now uses external batteries (except small batches of SX350 mods by individual modders), although some of those still have a USB charge port. If you need the internal battery, you can build (or commission someone to build) an SX350 device or give it some time. As we get more chips available in the market that do that kind of wattage, we'll probably start to see more variety in how they're built.