Is there an iPhone 6 recall?

There was a notice for 6S a few months ago. Not a recall really, just an offer:

https://www.apple.com/iphone-battery-and-performance/ - December 28, 2017 A Message to Our Customers about iPhone Batteries and Performance

iPhone Battery and Performance - https://support.apple.com/HT208387 - about power management, battery life

iPhone Battery & Power Repair - https://support.apple.com/iphone/repair/battery-power - battery replacement and cost

iPhone Service Answer Center - https://support.apple.com/iphone/repair/service - "Learn more about iPhone service options, warranty, and pricing." Repair times.

iPhone 6s Program for Unexpected Shutdown Issues - https://www.apple.com/support/iphone6s-unexpectedshutdown/

How to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) - https://locate.apple.com/country

Genius Bar (including making an appointment) - Go to https://www.apple.com/retail/geniusbar/ > Get hardware help > iPhone > Battery, power & Charging > select an option relating to your battery issue

There is none for iPhone 6.

See all active programs here: Exchange + Repair Extension Programs - Apple Support.