Which GoPro is it? I have the 3 and battery life is poor (30-45mins at 1080p). Ended up buying spares to swap over. The 3+ should have slightly more battery life though.
For the chest mount, I mount my GoPro upside down to get a better angle otherwise it does point down. There is a setting to flip the video on the camera.
I have the black, which came with a free wifi remote (never used), and a few more video/photo settings, it is supposed to film better quality in low light conditions which is the main reason I went for it. Not sure if this is still the same with the 3+.