If your old incandescent Ryobi flashlight bulb is dead, it's actually possible in most cases to swap it out for an LED.
【Perfect Replacement】Replacement for maglite led conversion kit 13.5S DC 3W 4-24V Cree LED Torch Bulb Replacement, Perfectly Compatible with Ryobi Maglite Indoor Lights, Bikes, Torches, Torches, Work ...