The 80+ pound shipping box for the battery arrived Friday. I had too much going on Friday evening, so installation became a Saturday task.
A note to any casual reader: If the instructions to install anything on an eBike mentions the possible use of a prybar/crowbar to perform an installation, it is likely going to be a tough day.
Yes, the instructions included the "dreaded mention".
And no, the battery pack did not want to fit in the assigned location. Mr. Prybar was not effective in addressing this fitment issue. Those who are familiar with the three mounts for batteries on the Goat can tell you they are threaded studs which rise up about 1/16th of an inch above the mounting surface. Any attempt to slide/pry/coerce the battery into place got hung up on the threaded battery mounting studs; and then stopped all progress.
I realized I needed to give the threaded studs a "haircut" for the battery to fit in the expected space. I settled on my Dremel tool with a narrow slit fiber-reenforced cutting wheel to slice them flush with the frame. I only had to do one set (the set closest to the fork), and the battery slid into the expected location like butter.
I got everything installed and then validated function one battery at a time by disabling the other battery. Then I connected both to make sure the pair would behave properly with each other.
The test drive will be later today. It will likely be over an hour at flat out to confirm combined battery capacity.
All epic tales should always include a picture, so here you go of the upgraded Motor Goat v3, with the factory 25 amp hour (ah) tank battery as well as the 50 ah frame battery. The display is showing a no-load voltage of 71.9 volts. Yeah, it does make it look more "motorcycle-like".
The battery also shipped with a beefier kickstand and a 14 Amp charger for the big battery.