Types of batteries....

[Bailey Boat]

Forethought and action finally pays off!!! This time last year I had a hodge podge of battery powered crap that needed D, C, AA, AAA. I began to notice that fewer merchants were carrying D and C size lights and batteries so I began converting my stuff to AA and AAA.
This go round it paid off. I got out my small lanterns, flashlights, radios and other stuff and all I now own runs from the small batteries, easier to find and seem to last as long as the D's and C's ever did......

 

[Dale Gribble]

Sanyo Eneloop are good batteries. They are rechargeable and hold their chrage well. I only have the AA size, but Sanyo makes C and D size adapters, allowing use of AA cells with equipment powered by C or D cells.

 

[noway2]

Costco is a good place to stock up on batteries. If you can find an adapter to put the small ones in larger devices, it may pay off in a crunch. I noticed before the storm, C and D were nowhere to be found, but the smaller ones were all over.

 

[Ikarus1]

Even better is to ditch to ancient 1.5v batteries altogether and get you some 18650 3.7v goodness. They last forever even with 500+ lumens, and even the cheap batteries are good. Since almost every larger vape machine uses them, they're cheap and in stock at vape and smoke shops everywhere.

This thing is a high quality low cost Martian communication tool

Revtronic Rechargeable Flashlight - Super Bright, Waterproof LED Flashlight for Camping and Hiking, 800 Lumens CREE LED Flashlight, Adjustable Brightness - Bundle with USB Smart Charger, 18650 Battery https://www.amazon.com/dp/B00XTGVRX6/ref=cm_sw_r_cp_apa_DxuNBbDD624YM