CMOS Battery location

[rdupless]

I am having issues locating the CMOS battery.  The original owner carried the laptop in for a repair, but the repair was too expensive.  My assumption is this repair shop removed the CMOS battery and I can't locate where it was located. Does anyone have any idea?

[Paul_Tikkanen · Accepted solution]

Hi:

Most of the newer HP notebooks such as yours do not have a CMOS battery.

The internal battery maintains the clock and BIOS settings.

Below is the link to the service manual for the 15-da0xxx model series, and as you can see...no RTC (CMOS) battery is listed in chapter 3 nor is there a procedure to remove and replace the RTC battery.

HP 15 Laptop PC Maintenance and Service Guide

[WAWood]

@rdupless 

I'm going to be presumptive in that MOST folks coming here asking about CMOS batteries in laptops are trying to remove that to reset a password -- which, of course, does NOT work.  IF that is your issue, then you are likely stuck because any BIOS or power-on password is encrypted into the firmware on the motherboard.

[rdupless]

I am absolutely in disbelief. I considered the CMOS battery as an unreasonable concept years ago and considered the local battery as a replacement. But didn't have a solution if the local battery completely discharged and having to configure CMOS settings periodically. Absolutely no one at HP could provide a solution to my problem, and the manual didn't provide any information. They attempted to sell me a CMOS battery for a system that didn't have one. I viewed several motherboards, and couldn't locate the CMOS battery connector or RTC connection. My final solution was searching the motherboard for a new surface-mount battery. I truly appreciate the information you provided. It is like an introduction to viewing the Holy grail. Wow!

[Paul_Tikkanen]

You're very welcome.