Forum Thread

Flashlight for unprotected 18650 batteries?

hpcaub 23 10 March 1, 2016 at 07:32 PM
I've got a handful of 18650 batteries that I pulled out of a couple Makita battery packs that went bad. I've got a charger that will charge them, but have not figured out a use for them. I'm not sure if they are protected or not, but to be safe am assuming they are not protected. Are there any decent flashlights or other gadgets that have protection circuitry built in?

I hate to throw out good batteries, but also don't want to over discharge them and have them blow up or catch fire!

I'm not an electrical genius, so have no interest in building/soldering, etc to make something work. I just wanna buy a cool flashlight that will be really bright to use these batteries in!

Any ideas???

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#2
look at the ring/gap, ring on both sides are protected. if not obvious, use fingernail push it. some are both on the same side, so it looks much thicker.

you are worrying too much, just shut it off when dim, i got a dozen unprotected.

i don't have a recommendation of flashlight
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#3
Wait, a 18650 battery can get blown up if I leave it alone? I have like 4 of them on shelves in the garage.
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#4
they won't blow up if over-discharged, they just won't charge back up - you can measure them, the unprotected ones will be 65mm long, while a protected one will be 68mm long
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#5
protected is not safe enough to near flammable. Lithium battery may go bad any time, anywhere, any condition. after so many news and seen it with my own eyes.

just treat it like a bomb, if other smaller batteries are TNT, 18650 maybe like C4 because it's thicker metal, may upgrade to nuclear if burn down whole street on a windy day instead of just one house.
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#6
Well, I measured and the batteries are just over 64mm, and have a ring at only one end, so I'm pretty sure are unprotected. Still looking for a good flashlight to try these out on.
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#7
Take a look at the Convoy S2+ and C8. I've got several of both and they are really nice 18650 flashlights. I think you are much safer with single cell lights when using older 18650's.
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#8
Can someone tell me what I should do with the 4 of them on shelves in the garage?
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#9
Quote from xxxHolic View Post :
Can someone tell me what I should do with the 4 of them on shelves in the garage?
If I were you I would go get a cinder block [lowes.com] and a bag of ready-mix concrete.

Mix some concrete up and fill the voids ½ way, toss 2 batteries in each void and then fill the voids completely up to the top. Allow the cement to cure. Now you have a high powered cornerstone. [reference.com] unlike any other. ZzZZz

Or you could recycle the batteries.
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#10
Quote from dale_101798 View Post :
If I were you I would go get a cinder block [lowes.com] and a bag of ready-mix concrete.

Mix some concrete up and fill the voids ½ way, toss 2 batteries in each void and then fill the voids completely up to the top. Allow the cement to cure. Now you have a high powered cornerstone. [reference.com] unlike any other. ZzZZz

Or you could recycle the batteries.
The batteries are new. They come with the flashlight which I bought on eBay. It's one of those chinese flashlight.
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#11
Quote from xxxHolic View Post :
The batteries are new. They come with the flashlight which I bought on eBay. It's one of those chinese flashlight.
yes, however you asked for advise. I gave you mine. hug
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