User Manual
Page 101
... an internal real-time clock (RTC) battery. HINT: Once the battery is fully charged, we recommend that the battery charges to a month when the computer is almost completely discharged. The RTC battery may not start charging immediately under the following error message during startup: BAD RTC BATTERY BAD CHECKSUM (CMOS) CHECK SYSTEM When fully charged, it...
... an internal real-time clock (RTC) battery. HINT: Once the battery is fully charged, we recommend that the battery charges to a month when the computer is almost completely discharged. The RTC battery may not start charging immediately under the following error message during startup: BAD RTC BATTERY BAD CHECKSUM (CMOS) CHECK SYSTEM When fully charged, it...