Hi Aaron. Welcome to the forum. For you and others concerned about the battery drainage issue, allow me to put my thoughts here and give MY perspective on it. (I emphasize MY because this may not be others' point of views)
I have two S1Pros and have used them strictly in battery mode at about 500 gigs. They have never failed me during performances (ranging from 1 to 4 hours). The sound is perfect for what I need -- singer/soloist in restaurants and small clubs. I marvel at the weight, size and convenience every time I use them.
As a practice, I charge my units to the full charge before each show. As a result, the drainage issue is not a problem for me in real world applications. Even if it didn't have a battery drainage issue, I would still charge it up for each gig. I prefer a full tank before I start playing. Additionally, I carry the power cords so I could (in most cases) plug it in an outlet for the juice. I prefer to use the battery power for its convenience and minimizing setup, but as I said, if necessary I could just plug it in at most gigs. (Now in some cases, you just can't charge up before each gig so having a battery level and charging system you can depend on is important too.)
For those wondering whether to get a S1Pro or not due to the battery drainage issue -- I say consider whether it should be game changer or not. The Bose S1Pro is a fantastic compact personal PA system, and with proper consideration (keeping it charged before gigs), and it shouldn't be a problem. (Also, the newer units may not have this problem. However, this is something I am not sure about)
Now you may ask, why all the concern and discussion about the battery drainage issue. The simple answer is that the system was built to have the battery option and it should work correctly to provide that. We should be able to expect it to stay charged after it has been charged -- at least for a reasonable period of time. Without the discussion about this problem on this forum, Bose may or may not have become aware of it. Either way, Bose is working to fix it and has stepped up to getting each of our S1Pros working correctly.
I believe this is because Bose understands they have different customer audiences (audiophiles, home entertainment, etc.), and in our case as musicians many of us depend on our products to work correctly for a living. They appreciate this higher level of need and expectation, and Bose is committed to supporting our needs.
-- On another point, I noted earlier I have two S1Pros. Both have been sent in for repairs and the first one apparently wasn't fixed correctly as it is still losing about 5 percent of power a day when left unplugged. In my next message to this thread I will outline where I stand on all of that.