I've got a flashlight that takes 4 of those 18650s. I use it for tracking deer after they are shot. I call it the 2nd sun. Its hilarious when I go to help my buddy track a deer and everyone else is out there with shitty little flashlights and I turn that thing on and light half the woods up.
I know, right!!
Right now I am looking to build 12 volt battery for remote lights and camera on my property. Add a solar panel and I'm good to go. Seriously though I'll get a 30+ amp hour Lion battery for about $50-60.00, they usually cost $2-300.00. Plus I'll have built it myself. I get the cells for about a buck apiece on average, the good Panasonic ones that retail for about $6.00 each in small quantities. And the cool part is I get to build it! China sells cases for cheap, check it out.
Everything you need. Case, BMS, nickel strips for a 12v 30Ahr battery. I calculated the power draw of the camera and lights so this battery can run for almost a week without a charge. A 50 watt panel should easily do the job keeping it charged.
Man, I love this shit. . .
Edit: Bad math, it will run for two days without charge.
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