PSU board has a LM2576 buck step down regulator, 7815 regulator, and some other SMD ICs which I presume are for the battery charger.
So much bodge in this project, ramdom wires of different colours and sizes, the PCB layout from hell, the batteries shoved in whatever space they could find. Those disconnected wires on the batteries seem to be taps for individual cells, was their original plan to use that instead of the voltage regulator board ? Perhaps its to monitor individual cells to determine total battery life.
I'm wondering if the case it made from routed chipboard of some kind, I've seen that grain before.
I'm with Dave, how on earth could anyone make 11 of these without freaking out and spinning a new PCB. It's almost as if someone made these at home in their workshop, power tools and DIY pcb etching included. No idea why they would put a company sticker on such a product.
Did they give these to the customers as demo/learning units, or are they trade booth units that no one got to poke around with properly.