Hello everyone. I have this laptop, but the main battery is dead and it works only while plugged. So my problem is that everytime I unplug computer, and then plug it again and start, it shows me an error "163-Time & Date Not Set", and then the time is 00:00 1.1.1980. I already replaced RTC battery but it seems that its' not working. Another strange thing is that only clock is resetted, all settings I made in BIOS before are saved. So I went to bios, I saw the settings, and then the clock before it comes to error I mentioned before. Here is the picture:
According to HP's support site the only solution to that error message would be to replace the RTC battery. Since you've already done that, I would suggest checking the replacement battery if it's the same with the old one. If it's the same I would suggest replacing it again with a new one unfortunately.