Google "hp 15- dy0013dx cmos battery technical manual" then filter to images:
E.g.:
https://www.google.com/search?sourc...AhVLKVkFHVoFAt8QjJkEegQIERAC&biw=1778&bih=941
Go through the images and look for a match to your laptop/mother board.
The CMOS battery should be on the motherboard.
Also look for "RTC" (Real Time Clock) battery.
Reference the following video:
View: https://www.youtube.com/watch?v=z2WaaKS1xs4
And a variation
View: https://www.youtube.com/watch?v=DQmtIl21oFc
(Note that the battery has wires and a connector versus just the standard silver "disk" CR2032 battery.)
Key is that you correctly match your laptop (as the videos warn) to the procedure.
As I understand your post the laptop is all taken apart - correct?
If the above links do not help you find and replace the CMOS/RTC battery then take and post some photos of laptop's inner components.
Especially the motherboard.
Post photos here using imgur (
www.imgur.com).
Hopefully someone will be able to provide a more specific response regarding the battery and its' replacement.