The two questions that pop into my head are 1) How long can you use it with say an S6 before the battery is drained if I don't use the micro USB cable that the

The two questions that pop into my head are 1) How long can you use it with say an S6 before the battery is drained if I don't use the micro USB cable that they offer (especially with something like a game running on it) 2) What about storage. A modern 3d game requires quite a bit of space. Sure you could load a couple of them onto the phone but AFAIK the S6 doesn't even support SD cards...how is this handled? USB OTG? I read that the Gear has a microSD...can I really store all stuff on this or is there a requirement to leave some Gear apps etc. on the actual phone?