I need a new internal battery for my laptop.

[makdisney]

My laptop won’t charge above 69% and it dies with no warning at 22.  I have tried all of the updates listed on here and realize I must need a new battery.  Where do I find one on the site and how do I replace an internal battery?  I use this computer for school and don’t have time to send it in.

[Huffer]

Have you run a diagnostic on the battery through the HP Support Assistant app? I would do so if I were you and report the advanced results to us for analysis. This is a fairly new laptop, probably under warranty, but I understand you do not want to send it in for service. I would still hate to see you buy a replacement battery and find out only then the battery is not really the problem. 

But perhaps getting ahead of ourselves, here is the Service Manual:

Manual

Pages 36-39 have pictorial instructions for how to replace the battery. This is the part:

3-cell, 41-WHr, 3.6-AHr, Li-ion battery  920070-855

You are in the USA. You can find a replacement at amazon.com, or eBay. HP Parts Store no longer has it:

https://www.ebay.com/itm/TF03XL-Battery-Genuine-FOR-HP-Pavilion-15-CD-HSTNN-LB7J-920070-855-920046-4...

This is a third party battery from a reputable seller with next day amazon Prime shipping:

https://www.amazon.com/TF03XL-920070-855-15-CC023CL-15-CC050WM-15-CC563ST/dp/B07X1PN1NY/ref=sr_1_1?d...

Post back with any more questions and please accept as solution if this is the info you needed.