After close to 5,000 miles and however many charge cycles I'm starting to notice the range on my battery isn't quite what it used to be. Gotta assume that's normal—right?

With that, I like to push the range to the max and can't really settle for only 20-25 miles. So it's either replacing it—or upgrading.

What's the most straightforward way to upgrade the battery setup to get more range. Speed/acceleration/etc. really isn't much of a priority, I just want to take the ~30 mile range (mostly 3 assist) with a stock battery to at least 50+. Is there a single battery setup that can do this? What's the move here, with increased range as the primary objective?

Thanks all.