I went to the park on Friday night with the MTR and the new battery and the squirrels were out in full force, surely stocking up for the season.
At first blush, the new battery is working great. I worked 4 guys including a really nice long 2xQRP contact on 40m before the sun dipped below the trees and it started cooling off. I even worked some DX. The bugs were even pretty tame.
There's still more testing to do but so far, I'm loving it.