Is the battery easily replaceable?

Same question …otherwise ready to order….but now guessing it is NOT replaceable…I know other new app are not replaceable, and they are ignoring the question, until I find evidence otherwise it must be assumed this is a disposable ups

what is watt hours of this?

as per the specs 450 VA 255 Watts Charging time is 8 Hrs. Running time is ‎4 minutes Just enough to properly shutdown your device in my case I want it for my NAS Drive.