One of the biggest updates for the mid-size EV pair,

the Rivian R1S SUV and R1T truck, is a standard lithium iron phosphate (LFP) battery.

Rivian is now working on a mid-cycle upgrade for both vehicles.

The installation of a heat pump is the other noteworthy modification that should improve efficiency.

The Rivian Owners forum has a leaked certification certificate that featured both of them.

The 64-page document also includes the new battery and wheel combinations' anticipated EPA range.