So far I have been using our car (sometimes have to hike to the parking area) to keep my stuff charged, or I just take every portable I own, along with all the batteries, so if one dies, I have another to work with while I figure out the charging. One fest we had a generator and a strip plug, so that was handy. I too would like to find a reliable portable battery that isn't too big/heavy, but will charge a few times to make it worth having, do those exist?
To get this back on track, I am enjoying using the wood solo stem on my HI, it's nice for a few dry hits. I bet I could still use it in the Solo, I would just have a micro-bowl, a few hits at most. I inserted a SS tube from another one of the stems that came with the HI I got. It's a bit rough, cracked the wood a little, but the outer SS sleeve had to be pounded back on, and covers most of the cracked part. I could have gone slower, and done it right, I just tend to become a little impatient sometimes, and didn't really have the right tools to do the job properly. It does work great though