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Sigma
Joined: 03 May 2004
Posts: 48
Location: Sg
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| battery |
 Posted: Fri Jan 28, 2005 4:30 am |
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hi, all,
I know this is not the proper place to source electronic component, but this is the only forum i found is most active on embedded hw.
I have a project now powered by CR2032, which has a continuous current drain less than 7mA. But my board requires around 10-15mA coutinuous drain, not pulsed current. Anyone encounter any battery that is common enough, tiny size (comparable with CR2032 or slightly larger), non-rechargeable, 3-5 volt, capacity of 200mAh or more and finally can handle this kind of current drain. Thanks.
Sigma |
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Ttelmah
Guest
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| Re: battery |
| Posted: Fri Jan 28, 2005 5:35 am |
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| Sigma wrote: | hi, all,
I know this is not the proper place to source electronic component, but this is the only forum i found is most active on embedded hw.
I have a project now powered by CR2032, which has a continuous current drain less than 7mA. But my board requires around 10-15mA coutinuous drain, not pulsed current. Anyone encounter any battery that is common enough, tiny size (comparable with CR2032 or slightly larger), non-rechargeable, 3-5 volt, capacity of 200mAh or more and finally can handle this kind of current drain. Thanks.
Sigma |
Change your battery technology. The lithium manganese dioxide technology used in these cells, is not designed for high discharge rates. It is optimised to put a lot of capacity in a small size, at low rates. The highest capacity battery in this type of format, is the CR2450N, and while this has nearly 3* the capacity of a 2032, it is still not going to meet your requirements. Even at 7mA, you are running at over twice the maximum design current for a 2032, and will be getting about half the rated capacity.
A single MN9100 alkaline manganese cell, with a 1.5v to 3v switching inverter, will give you 3v for about 30 hours at 10mA, exceeding your requirements easily (and a lot cheaper...).
Best Wishes |
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libor
Joined: 14 Dec 2004
Posts: 288
Location: Hungary
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| Posted: Fri Jan 28, 2005 5:42 am |
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| I recently found this site, it helped me to clear up my confusion of various battery chemistries and their use: (like: primary = not rechargeable) |
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Guest
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| Posted: Fri Jan 28, 2005 5:48 am |
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Sigma,
Even larger (itīs AA size), you should try ER14505 battery. Itīs 3.6v @2400ma.
Gabriel.- |
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bas
Joined: 30 Jan 2005
Posts: 4
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| Why not lithium-ion or lithium-polymer? |
| Posted: Sun Jan 30, 2005 10:50 pm |
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Ultralife batteries (www.ulbi.com) makes some very small Li-Ion and Li-pol batteries. The nominal voltage is about 3.7V. These batteries come with all the protection diodes on-board as well.
The Li-Pol batteries come in a 30 mm x 20 mm package.
Li-Pol and li-ion drive cell phones--GSM in particular can draw over an amp at a time--they should work just fine for your application... |
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Ttelmah
Guest
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| Re: Why not lithium-ion or lithium-polymer? |
| Posted: Mon Jan 31, 2005 4:43 am |
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| bas wrote: | Ultralife batteries (www.ulbi.com) makes some very small Li-Ion and Li-pol batteries. The nominal voltage is about 3.7V. These batteries come with all the protection diodes on-board as well.
The Li-Pol batteries come in a 30 mm x 20 mm package.
Li-Pol and li-ion drive cell phones--GSM in particular can draw over an amp at a time--they should work just fine for your application... |
Yes, assuming he does not need a long 'shelf life', where these batteries fall down rather badly. :-)
Best Wishes |
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