a cheap 15$ 12v sealed lead acid battery would do the trick and last for hours and hours with LED lights: 15, 18, 27 watt etc. Just need a simple switch, battery, wire, and a little 12v charger
as far as i know, the predator has no charge coil, but other honda clones (lifan, JF) and the real deal (honda gx200) can have the charge coil/flywheel set up for charging and lights.