until they can get a natural bio power supply sorted from the cats body, I wouldn't have any size of battery embedded in any of my cats. 
Oh no nor me, I hadn't thought of it like that. I meant when computer technology allows some sort of tracker to be programmed on a microchip... I had not considered any sort of battery being put in the cat... never
It'll still need a power source of some kind
GPS satellites don't continuously scan the whole world for satnavs, like a vet would scan the shoulders of a cat looking for a microchip. The chip would need to send a signal out to the satellites and be in view of the sky - by default not possible if embedded in a cats body. The power drained from a battery by GPS modules is still considerable, especially in a continuous reporting state.
