Is this the battery I would need for my ARC remote?

You need to check below link for correct item.


https://www.dogtrainerstore.com/products/dobprebafor2?variant=58843499915

What battery do I need for 280ncp transmitter and receiver in collar

This battery Item #: TSC-BP20R is suitable for 280ncp.

What battery doi need for my RR Deluxe 10115 transmitter?

We do not have RR deluxe transmitter battery on our website.

For your information item # BP72T

What batteries do I need for my 280NCP transmitter and receiver?

For transmitter - Item #: TSC-BP12RT
https://www.dogtrainerstore.com/products/dobpbptrba?variant=58843653067

For receiver - Item #: TSC-BP20R
https://www.dogtrainerstore.com/products/dobpdoreba?variant=58843655627