Legacy rechargeable batteries

I have some legacy devices (like hefty flashlights) that use the old large D and C size batteries. I am done buying batteries. But I wondered if I could get one last round in rechargeable big batteries? Yes, indeed! They make rechargeable Ds and Cs! But you’ll also need a versatile charger. While I was at it, I also upgraded my Maglite flashlights to 10 times brighter LED bulbs. Brilliant! — KK