Flashlights. I have a lot of flashlights, generally for different purposes.
Not really into the very expensive units, but I have one that I got free when someone at a flea market told me I could have it free as it was broken. It wasn’t.
2 AA batteries and one LED; I think it’s an early Surefire or the like. Marked Extreme Light and 0.5 watt.
Very high quality case/construction and very bright for a single LED. I mainly use it when on after dark walks as our town is semi overrun with skunks prowling for food in people’s yards. I use it to spotlight if I suspect one is near, and have seen them several times.
For the most part I am completely converted to LED lights, however, The primary exception is a Colman flashlight lantern combo, that uses one single incandescent bulb, and converts to a lantern by sliding the lens housing out exposing a clear plastic “globe” It’s my tent “dressing light” when camping. I don’t expect them to come up with one like this Using LED’s any time soon…
I gravitate to the under $20 lights generally, and my primary daily use light is a small single LED, single AAA Dorcey that I have carried for about 10 years. I like it as it is reasonably bright, small enough to carry with me all the time, whether dressed casually or for executive meetings. I like it so well I bought a couple more to have as spares. It has been carried so long that most of the blue anodize is worn off, and the rubber “grips”, are long gone, and I replaced them with a series of O-rings.
I have a number of Mag lights, Large and small, but the only ones that I even like are the 2AA “pocket” size, and have converted a couple of those to LED. You lose the focus capability, but I’ve found that feature to be grossly overrated.
Another freebee no name flashlight, (this one from a “free box” at a yard sale – I think they thought this one broken also, but it was just a switch under a rubber thumb cover that is “fussy”) has about 100 or so LED’s, and has a body about the size of std 2D cell flash light, with a slightly larger lens housing. VERY bright, but 99% of the time I don’t need or want that brightness. It is handy for checking my yard for those damn skunks…
Every vehicle we own has an inexpensive LED flashlight in the glove box with 2 AA lithium batteries for emergency use. The nice thing about lithium batts is there extremely long shelf life, and so far I’ve never seen one leak.
I have a number of older Ray-O-Vac Roughneck 2 AA battery pocket lights, that I used to use extensively for casual and camping use, but these are mostly in a kitchen drawer except for one I have hanging next to the “Network” panel that has my phone punch down panel and the network Modem router and hubs for all the computers in the hose, along with a small desk side style UPS to keep them running during power outages. (Three so far without losing a connection!)
Batteries, While the kids were using and abusing flashlights I used rechargeable alkaline batteries extensively, but they carry a steep cost in useful life per charge, so I use them less these days for that purpose. We do use them in the kids game boy hand held junk a lot, and they each have at least 2 sets per device…
There are probably about two dozen other flashlights around, including some old Tekna lights, which in their day were bleeding edge technology. Some of the others are inexpensive ****, but most are inexpensive but pretty decent quality. I find what kills most flashlights are leaky batteries.
Greatest light i've ever owned...might be the last.
They're that good. I'm older and can't see ****, under dashes and engine compartments are darker, I work in a cave, etc. Hell, I have two so that one is always ready. I'm talking the rechargeable models. none of those expensive lithium batteries for the tactical lights for me. 
