Matt,
Just did a DUMB thing that you should avoid: When changing the SWCG cell, only hand-tighten the new cell in, don't use a wrench.

Today, I did just that and cracked the top union ring (facepalm). Luckily, Autopilot (my SWCG brand) has seen this many, many times and rather than having to replace a $500 cell, they make a replacement repair kit for roughly $20....but now I have to wait for it to be shipped...