Thanks Steffen & Tim.
Thanks for link Tim, I had a look at all 200+ reviews. Only about three of them talk about the actual go-to feature mounted on a scope (from the looks of it anyway).
Most of those reviews seem very favourable, and as many have said on that review, I too much prefer this to Google Sky
The battery has lasted me for at least three hours in the past, but to be honest, I use my maps and computer software more than my phone. As I’m still learning the sky, I favour manually (with help from computer software) working out the constellation patterns & objects if I can- some admittedly (and naturally) do throw me. So as much as I’m keen to use it as a go-to device, the data base on the phone for objects is pretty limited, which for me is a good thing, as I want to still be able to learn the sky star hopping manually. There have been many occasions when my lap top & phone (forgetting to charge phone!) have given up, but I don’t get in a fluster, as I’m very happy to use my maps and if I maintain observing by the manual method, my night won’t come to an end.. just might take me longer.
I am a strong believer in learning the sky.. no doubt go to will get me there quicker, but in my opinion, it’s not just about getting to that object- it’s familiarising myself with the sky, seeing all those beautiful asterisms along the way, all those beautiful coloured and different star sizes of varying brightnesses, accidentally bumping into objects, and just as importantly, the reward in finding it myself. Even though one object might take me a number of sessions to find at which case I’m tearing my hair out and by day 5, I would welcome any help so I can move on with other objects before they disappear of the sky for that season.
I’m not finding the red light on it to be an issue for me so far- perhaps because I’m observing from my light polluted backyard.
Regarding the phone getting wet, I had thought about that, but I thought that the heat from the phone would stop dew getting on it as the app. stays on the whole night unless I get out of it. Hmmm will have to see how it goes, otherwise, I guess I’ve got to come up with some protection for it. Perhaps a plastic sleeve of sort sort.
I will let you'll know how it goes once I get the Velcro and have an attempt with the go-to feature on the scope.
). 
,You'll want a waterproof enclosing.
