Did a full calibration cycle (that took for EVER because this battery (thankfully) lasts so much longer than my old tired one!!! woohoo!) All is well. If you get the red battery light just complete a full calibration cycle and bob’s your uncle!
I just did the swap, followed all the directions (and it did make sense to me to do it properly and remove the speakers and everything to avoid damaging anything) . Either way, when I booted back up and am doing the initial discharge, my battery indicator has turned red and says “service battery” I am not sure if this is just because its in the middle of calibration, or if there is a problem. I assume there is no problem, but worth mentioning that it showed up.