What voltage should the cmos battery be on Acer travelmate2300??

Most systems use a "coin cell" battery similar to the batteries in garage-door openers and automobile security keyfobs. You need to get the battery out and see what the type is, such as CR-2032 (3V). If you go to the Acer web site, you should be able to get that information from their support pages for your computer. That said, most are 3 volt devices, but some are 6 volt, some more, some less...

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.