Any time I get a crapped-out laptop pack, I always scrounge the cells. They go as far back as ancient panny-As that still work fine.
I don’t use them in high-strung lights or anything, but a light that doesn’t draw more than an amp or two is fine, especially if used well below “turbo” most of the time.
Me too. Thanks. I tend to find that even in really old laptop packs some of the batteries are okay.
As well as being “leaky,” (and on the front of my bike or helmet where there is a lot of wind) I don’t think that the lights I am using draw all that much current. I have never noticed them to get hot.
Back when I used a bike light this light which used two or three batteries next to each other did get warm however.
I meant air leaks because it’s a zommie. Not very watertight, let alone airtight.
A venting cell in one of those should let some pressure out before it blows.
Happens to me on my motorbike all the time. A quick half second switch to my main beam (4000lm and set rather high) usually convinces them to switch back to low beam very quickly 
In my experience many car drivers don’t even think that they are blinding motorbikes/cyclists, and a quick flash makes them realize that they are indeed blinding us and switch back.
Cuts both ways that. A lot of cyclists here in the UK don’t realise their several thousand lumen bike lights are blinding and angle them up for distance.
@Lightbringer
Thank you. I understood you. The quotes around “leaky” were just citation, not doubt.
I do that with my XLM T6s on my helmet but they are not very powerful so sometimes cars just ignore me.
@RichH
I think I have my light down far enough not to annoy cars. My new XML T6s arrived.
This is my review of a genetic cheap zoomie from 2018.
Same here! I have recently purchased a good 18650 battery off simon mao convoy flashlight website. When I opened the package I was surprised when I saw the small black flashlight host. I either thought he gave me the wrong order or he gave me a free gift. After opening the S2 sized flashlight labelled Smarter cree q5 my battery was in there with plastic insulators. Then i figured its illegal or dangerous to ship loose batteries cells outside of a device. No wonder the batteries are cheaper when bought alongside a flashlight.
Nah, you just give it to someone you hate.
