Default Any way to get better heat dissipation?

Well, since I'm replacing my one x battery with one x+ battery, wanted to see if there is any way to increase heat dissipation.
I did find oen option, replacing copper foil with pyrolytic graphene sheet from panasonic, but those are quite expensive.
I couldn't think of any other solution so I'm hoping that some of you guys know.
I've already uv my phone to the edge of stability(any more and it chrashes while gaming) and it still hits 70C and battery 49C :/
da fuq is happening?