It's been about 18 months since I last took a look at Windows Phone. Since then I've been using Android. However, a couple of things are starting to concern me about Android: 1) Google's inability to quickly push out security patches to all Android devices, recently highlighted by Stagefright vulnerabilities. 2) The almost universal move by Android handset manufacturers away from phones with user-replaceable batteries. With the new Lumia handsets, I'm starting to think about Windows Phone again. Related to my concerns with Android, I have a couple of questions: 1) Is Microsoft able to push security updates to Windows Phone without OEM and carrier getting in the way? I wouldn't be interested in signing up to a beta program to achieve this. I'm talking about phones on regular Windows releases. 2) I noticed the new Lumia phones have user replaceable batteries. Has anyone (either Microsoft or 3rd parties) announced extended batteries for these phones. My interest in user-replaceable batteries is not because I want to carry around a spare battery, it's because I want to install a larger capacity battery (I currently use a 5200 mAh battery in my old Galaxy S4 and love the freedom of never having to worry about running out of charge even on a heavy use day). --- Also, additional questions - I'm sure the main issue with Windows Phone is still apps. However, I think I'm far less obsessed with having lots of apps on my phone than I was 18 months ago (In that time I've come to realise I actually don't use a lot of them - especially since I carry an iPad mini in my bag much of the time). However, one potential sticking point is Google Photos. I'd like to continue using this. Are there 3rd party apps on Windows Phone that provide auto-backup to Google Photos and Google Photos viewing? - I've noticed continuum. It looks impressive, although not something I think I would use and not a draw for me. Are there any other new stand-out features (last 18 months) that's useful to know about when considering whether or not to switch?