16hr charge time!!! I thought times like that disappeared with Halogen & HID bike lights!
You should talk to Smudge about getting a faster charger.
Okay, you dont seem to have much choice then, just make sure you’re charging them away from flammable stuff, like carpets/curtains etc…
I use/sell P7/flashlights, so i have a lot of loose batterys, and i keep them all in the fridge, most are at about 50% charge, with a couple at full charge ready to go if i need them.
If you have a look at the storage temp in the link i gave you, you lose a surprising amount of capacity just storing them at room temp in a year!
Its up to you guys what you do, but this is just stuff ive learned over the years of dealing with them.