Monitor or Battery problems acer ka222q

SpudMunky

Hello...I bought acer ka222q from argos a few months back and I am now having a problem that I cant get sorted.
Whenever I shut the PC down the power light on the monitor remains orange and I need to push the top button on the back of the monitor to turn it off completely
When I power the system back on I hear a beep and the message on the monitor reads tells me that the time and date are wrong and that I must reset this. It also tells me that if I keep getting this message there may be a problem with the battery. I keep getting the message...
I hvae tried to find out how to reset or even change the battery but I am lost and cant get any answers to help me with this...
Anybody any idea?  

SpudMunky

I have set the date and time a number of times but its still no good...