RC-230; likely to be quite old, and the batteries don't like being left flat for a long while – could be dead. Plus there's a fuse inside that could have blown – need to unscrew the case to get to it tho'. Also check for broken wires (especially near the switch) and dodgy connectors.
They were 'adequate' lights in their day, limited run time and a bit weighty, but bright enough to ride with in the days when everyone else was using similar systems. Many of us started nightriding with these or Smartlights.
Not really worth the expense of a new battery, it would still be way outperformed by most modern LEDs, DX or similar probably a better bet.