Have you seen the cost, the weight and the size of the Vive wireless pack?
Wireless data transmission costs huge amounts of power, especially at high res 90 fps stereoscopic with ultra low latency.
I’m sure you’ve experienced how fast your cell phone drains from looking at a few websites.
It also needs a very high bandwidth data transmission, all this is not cheap.
My cellphone needs more than 1 day to drain and I'm playing Hearthstone with it while having 4G, bluetooth and wifi on at all times. You need to get a better phone. Wireless transmission is extremely efficient nowadays and will only consume a tiny fraction of what the display does, which is what the battery pack is mostly for.
The battery pack is just huge because the Vive is not meant to be used wireless and has as such zero energy saving features and hardware, let alone proper compression. Also because it's external and not integrated. A proper headset that's designed for wireless use is gonna be just fine.
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