Home Made Li LED Flashlight?

Batteries and chargers.

Suggestion: forget it. If you want a flashlight, watch bensbargians.net for a sale. Or read the candlepower forums. Or try dealextreme. There are lots of very good lights cheaper than you can buy the parts in onezies.

Do this thought experiment. Take out the battery. Unplug the charger. You just disconnected all the stuff in between that keeps the battery from catching fire when you charge it.

And someone will surely chime in here and say that the battery has a protection circuit built into it. And they're probably right...probably. It's there as a secondary protection method in case the phone charge circuit fails. You do not want to rely on it for daily charge management.

Depending on how old, the battery may already be shot.

While it's possible to do what you want, it's not economically feasible and the result may not fit in your pocket. And it's very embarassing when your junk catches fire.

If you knew what you were doing, you wouldn't be here asking.

Find a hobby that's not so incendiary.

Mike, do this thought experiment.

The OP wants to make a flashlite for a reason you do not understand.

Gareth.

No need to get snippy with me. He asked for advice, I gave him some very good advice. And I told him exactly why it was a bad idea. And gave some suggestions on where to find a flashlight.

I'd have given him the same advice if he'd wanted to power his car from a mixture of hydrogen and oxygen in the exact ratio to produce the most violent explosion. Just 'cause there are thousands of websites hawking the idea doesn't make it a rational endeavor for a newbie.

Funny story. I've actually met only one HHO car guy in person. He blew the valve covers off his engine and destroyed the whole intake system when it exploded. But I digress...

If YOU have some advice for the OP, this would be the thread to present it. Addressing me won't help him at all.

Well, you can learn a lot from the wording of a question...if you bother to think about it. I expect that you're yanking on the wrong end of the chain. Sounds like the problem is that he has some phones he'd like to turn into something useful. Flashlight just might be the first thing he thought of.

I don't question his reason. His hobbies are his choice. I question the sensibility of the proposed project and answered his question in a way that seeks to insure that he keeps ten fingers and two eyes and a house that's not made of charcoal.

Your risk tolerance may vary. Advising a newbie based on YOUR risk tolerance is irresponsible.

But if you were paying attention, that's his reply to the flashlight post. Then somehow his reply (maybe a paste where he didn't intend it) to the tablet charger post was tucked in below it. If you don't read his reply carefully, you do think the whole thing is about the flashlight, when it's not.

Michael

Mike, you could have just answered "make sure you build it into a fireproof case", instead of the condescending presumtious posturing you chose to write instead.

Answering the question "I would like to make a flashlight" with "go and buy one instead" is not particularly useful.

Gareth.

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You might want to drop by Home Despot and look for their 50-LED flashlight. It has a metal case, takes four AA (not AAA cells) -- and costs $10. Buy some 2500 or 2700mAh NiMH cells and a charger.

This is your second post in the thread. And you've yet to make any input to the OP.

Let's hear your advice on how YOU would create a flashlight out of a cellphone. Don't skimp on the practical details.

Actually, Mike, I believe I have made an input to the OP, and that is to not be intimidated by people like you.

Gareth.

Batteries and chargers.

It's fairly easy to modify a variety of flashlights to take a different battery or lamp; the incandescent bulb/reflector assembly is big enough that removing it makes room for lots of electronics and/or odd batteries.

The usual cellphone battery is rectangular, though, and relies on springy contacts to its pads. You'll need to make a rectangular holder, with (perhaps) pogo-pin contacts.