Purchased P4P with two extra batteries on June 14, 2017.  DJI GO4 app shows ones of the batteries has a bad cell.  Is this battery still under warranty?  If so what steps can I take to have it replaced?

Thanks

Ok first you need to contact dji support and start a claim if you go back out of the forum you should see the dji support button follow the links to start your cliam.
And yes it should still be covered under warranty but dji will asses your claim

Warranty expires on Dec. 14.   Better hurry!

Sent mine back, still waiting after 8 months

fans52cfa4bf Posted at 2017-12-4 05:05
Sent mine back, still waiting after 8 months

Hi, sir. Can you tell me your case number or ticket number? I will have a look for you.

Hi, sir. Please contact our support and prvide the purchase certificate as soon as possible. Here is the link: http://www.dji.com/support.