mercalia wrote:well I was thinking of getting a Moto E4, one of the few Android phones you can still replace the battery
Oddly, the Moto E4s I can see don't have replaceable batteries, although it looks like there's been more than one model with that name (
). It seems like the major makers (Moto, Samsung, Sony, Huawei) rarely have replaceable batteries now, while smaller competitors (LG maybe the biggest?) do.
But the whole Lumia range was discontinued last year and the 635 model 18 months before that, so I suspect spares availability will be tailing off anyway unless it uses a common size.
mercalia wrote:But the version it has - Android 7.1.( Nougat) seems poor at maintaining wifi or even gps connections- do a google about Android Nougat wifi problems - and not just for that particular model many that use the same version
I've a Nougat device and it works fine. I don't google, but I can find plenty of search results - but searching for "Windows Phone 8.1 wifi problems" also returns plenty of results - not as many as for Android Nougat but it's a much less common system so that's understandable.
Wifi is particularly annoying to debug, more so than most networking, but the tools for doing so on Android are better than most. Train wifi tends to be rather overloaded and brittle these days and it seems a bit random who gets stable connections - but I'm glad it worked for you once.