Yes, but why 25C? Weight savings in batteries can be achieved as the C rating drops. An 8000mAh 15c Lipo can be had for roughly the same weight and cost of the Solo battery. For me, the primary reason I would like to see a 'battery case' designed for the Solo is the freedom of choice. If I want to run a larger/smaller battery to fit my mission requirements, I have that choice. Same reason I use an Android; I don't want Apple deciding for me what app I can run (screen recorder for example).
totally understandable. i took a battery apart and examined it. i have come to the conclusion that a higher capacity battery won't have any roi if designed by 3dr or any other manufacturer. if it was a just a dumb battery then yes it could be done on the cheap, but if you want it to remain a smart battery, then no. and even then for the flight time gains to even be worth it, solo would need weight saving, more efficient motors and props.