Home Made Li LED Flashlight?

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Have a couple of older Motorola cell phones with good 3.7V 950mAh Lithium Ion
Batteries and chargers.

Would like to use these Li batteries to make a Li LED Flashlight.

Hope others have tried this and have some suggestions.

Thanks

Ken

Re: Home Made Li LED Flashlight?
On 12/4/2012 7:33 AM, KenO wrote:
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Batteries and chargers.
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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.

Re: Home Made Li LED Flashlight?


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Mike,  do this thought experiment.

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


Gareth.

  


Re: Home Made Li LED Flashlight?
On 12/4/2012 1:29 PM, Gareth Magennis wrote:

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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.
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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.
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Re: Home Made Li LED Flashlight?

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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.  



Re: Home Made Li LED Flashlight?
wrote:
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r
d
of
ite
uy

100% agreed

Re: Home Made Li LED Flashlight?
On 12/5/2012 2:16 AM, Gareth Magennis wrote:

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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.
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Re: Home Made Li LED Flashlight?


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


Gareth.  


Re: Home Made Li LED Flashlight?
On Tue, 4 Dec 2012, Gareth Magennis wrote:

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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


Re: Home Made Li LED Flashlight?
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.  


Re: Home Made Li LED Flashlight?
On Tuesday, December 4, 2012 7:33:50 AM UTC-8, KenO wrote:
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Batteries and chargers.

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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.  

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