If you are only looking to charge one lithium cell, its hard to beat the XTAR ANT MC1 PLUS
If you want to charge mulitple cells or NiMh cells, or other variants, than there are several cheap decent chargers to be had for ~$20.

Welcome to BLF! Hope you enjoy your PD25, looks like a nice pocketable form factor. It’s likely all you will ever need, but if you hang around too long you’ll find other lights you can’t live without.