Only sync photos to icloud when plugged in?
For syncing photos to iCloud, you can turn it off by going to Settings &gt; iCloud and search for Photos and then turn off My Photo Stream.

If you want to access photos uploaded on iCloud, you need to turn on iCloud Photo Library (Beta) (in the same settings) so that it will automatically upload and store your entire library in iCloud to access photos and videos from all your devices.