The cmos battery is just a watch battery, its a very quick fix on a desktop but on a laptop it means taking the bottom off which it a bit more fiddly. Don't know what type of watch battery it is (of if they are even all the same type) but it will be a small coin cell sized battery that you can just pull out and replace once the bottom of the laptop is removed to expose the mobo.
Ah I thought it was! I'll just open it up the octane II is very easily opened. I'll remove the battery and replace for identical battery! thanks never had this issue before
I'm using laptop since 2005, such thing never happens to me. Once I face the same issue in a desktop pc of one of my associates, we took it to a PC repairing lab and it was fixed right front of us in a minute. If you could find an easy solution and could get some more info of CMOS battery (if it all same for the laptops and PCs) then do let me know and upload some pics also if possible for me (in case if my CMOS stops working sometime).
Thanks