Would you buy an after market battery for your P3 Standard?

Hello and good day Ruffdog64. Thank you for reaching out and for the inquiry. I would recommend using a genuine DJI Intelligent Flight Battery for your DJI Phantom 3 Standard for reliability and compatibility purposes and to avoid unwanted incidents while using or flying you drone. In addition for genuine DJI Products and Accessories, you can check the link below. Thank you for your support.

www.dji.com/where-to-buy

Never fly with one of those.  They cannot be trusted.

No

(What is it with replies have to longer than x characters?)

My short answer is no.  

Ask on another Forum that is not owned by DJI.