Please show anywhere that this "water based LiPo" tech is shown or even rumoured to exist.
As I said LiFePo4 is the weapon of choice for all high end long term use and is more stable, you can use this and have a similar or slightly lower voltage than a NiMh battery but far more current delivery with the inherent stability that is considered to be even better than a Pb battery that's been starting our cars for half a century or more.
Did you even read the intro post, I've been around this hobby longer than most have been sucking air and have seen most technologies come and go, I used to be a development engineer for a 6 coloured logo and played with everything that spins or goes fast to the point of being competitive. I race GoKarts and a modified production sedan and this point I am just playing and not being too serious. It doesn't mean that I don't do anything to the best of my ability.
I like tanks, they are beautifully sophisticated but essentially non competitive, closer to chess than RC.
I suggest you buy lots of NiMh packs and keep them in reserve as there is no option in the future of all electric RC.
Maybe I can sell you a cupboard full of 27Mhz radios to go with your vintage ethos?