This looks like an interesting solution. Been repurposing some camera power products as there are some good value solutions. I'm currently trying to build a similar cart to those above and have experimented with a 150wh BEBOB V-lock battery. Using a 3a charger it will continue to O/P 16v from the V lock terminals while being charged through the DTap port. I've only tried this while the battery has been fully charged so i need to see what's what when it's running low. The charger actually has 2 DTap charging leads and a 4pin XLR 16v power O/P so hopefully it has enough to power the kit and charge the battery 1 way or the other, albeit slowly.