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'[EE] handheld case that comes with built-in rechar'
2009\05\11@143344 by John Waters

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Hi All,



I built a circuit to be used as a small handheld device. But it takes 5V and consumes quite a lot of power. So I'm thinking of using rechargeable battery as the power source.



Is there any handheld case that comes with built-in rechargeable battery (preferably with charger as well)? I hope, with this kind of cases, I can just need to put my circuit in and the the built-in rechargeable battery will provide the power. When the power drains out, I just need to insert the charger plug into it to charge up the battery.



Is such thing available in the market? If not, Can someone suggests how to make something like that myself? Or some alternate solutions? I just can't use standard battery since my experiment shows that the device will drain out 4 AA alkaline batteries in 2.5 hours, which is too expensive?



Thanks in advance!



John





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2009\05\11@145622 by Pablo Ginhson

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What kind of batteries do you want to use?, May be a Li-Ion pack will reach your needs, on that way, use the MCP73838.

I used on one project and work well, look at AN1149

Regards

Pablo Ginhson

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> -

2009\05\11@155038 by Richard Prosser

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How about using a cheap rechargeable torch?

RP

2009/5/12 John Waters <john_fm_watersspamKILLspamhotmail.com>:
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> -

2009\05\11@202935 by Gerhard Fiedler

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John Waters wrote:

> Is there any handheld case that comes with built-in rechargeable
> battery (preferably with charger as well)? I hope, with this kind of
> cases, I can just need to put my circuit in and the the built-in
> rechargeable battery will provide the power. When the power drains
> out, I just need to insert the charger plug into it to charge up the
> battery.

I've seen plastic cases that have openings where you can put 4 AA
batteries. Not exactly what you have in mind, but you can take the
batteries out and put them in a charger.

Gerhard

2009\05\11@213550 by Charles Craft

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Gut an ipod.  :-)

Closest I could find at Harbor Freight is the Rechargeable Cordless Shaver.

-----Original Message-----
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>-

2009\05\12@093616 by Tony Smith

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face
> Hi All,
>
> I built a circuit to be used as a small handheld device. But it takes 5V
and consumes
> quite a lot of power. So I'm thinking of using rechargeable battery as the
power
> source.
>
> Is there any handheld case that comes with built-in rechargeable battery
(preferably
> with charger as well)? I hope, with this kind of cases, I can just need to
put my circuit
> in and the the built-in rechargeable battery will provide the power. When
the power
> drains out, I just need to insert the charger plug into it to charge up
the battery.
>
> Is such thing available in the market? If not, Can someone suggests how to
make
> something like that myself? Or some alternate solutions? I just can't use
standard
> battery since my experiment shows that the device will drain out 4 AA
alkaline
> batteries in 2.5 hours, which is too expensive?


As other have said, you'll probably have to find something and then gut it.

You can get cases with battery compartments (typically 2xAA or 9V) or those
little 2 button remote things.  They won't have any circuitry though.

You might want to consider something like this -
<http://www.dealextreme.com/details.dx/sku.3060>.  You could use it as is,
or remove its internals and put them into another case.  I've got a couple
of those, they work quite well.  Their only failing is you need to remember
to switch them off, they go flat even if there is no load.  I haven't
bothered to check their capacity either.

Tony

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