Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad

Hello everybody,
Can help anyone to resolve my problem.
I have an Thinkpad W520 (42823FG), BIOS 8BET60WW 1.4 When I disconect AC power and remove battery and connect again, I see this message on screen:
"Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad
Press Esc to continue or F1 to enter Setup"
Is this a system board problem or CMOS battery problem ?
Thank you

Hello and welcome,
It's probably (hopefully) just the CMOS battery. The easiest way to find out is to just replace that battery.
Page 85 of the Hardware Maintenance Manual:
Hardware Maintenance Manual
Here's an example of the battery. I'm not recommending (or not) this vendor:
http://www.ebay.com/itm/New-Lenovo-ThinkPad-W500-W510-W520-W530-W700-W701-W701ds-CMOS-RTC-Backup-BAT...
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad

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