I am intrigued by the battery powered strobes coming out of China. I have been a commercial photographer for many years. I am winding down now and tired of lugging around my Speedotron black line power packs. I can live with having less power. What concerns me is the chance that 5 years down the road you need to replace the battery and the manufacture has either discontinued your battery, or has gone out of business. I've never heard of these brands before. Does this worry anyone else, or am I just over thinking it?