Author Topic: Coin Cells  (Read 1745 times)

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Offline pomprockerTopic starter

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Coin Cells
« on: January 13, 2009, 01:51:56 PM »
How come I never see anyone using coin cells in their robot?

Aren't they pretty small and carry a good amount of voltage?

Couldnt I stack two coin cells and I would get the 6volts I need that I get from my 5-cell AA NiMH pack?

http://www.powerstream.com/licoin-charger.htm

Offline Soeren

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Re: Coin Cells
« Reply #1 on: January 13, 2009, 02:12:58 PM »
Hi,

How come I never see anyone using coin cells in their robot?
There is at least one on the net - a tiny line follower, but it's rather boring.

Aren't they pretty small and carry a good amount of voltage?

Couldnt I stack two coin cells and I would get the 6volts I need that I get from my 5-cell AA NiMH pack?
Voltage is not enough.
With less than 200mAh in LiIon button cells, you need very low current motors for any kind of fun.
Besides, primary LiIon button cells cannot deliver very high currents and the rechargeable types even less

Much better to use Zinc/Air for small 'bots. The 675 cell holds around 650 mAh (1.4V) in the same size of an AG13, so they are very good power/weight and capacity/weight wise. Alas, they are primary cells.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline Razor Concepts

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Re: Coin Cells
« Reply #2 on: January 13, 2009, 08:19:27 PM »
I got 20 2032 batteries (20mm 3v) for under 4 shipped here, best deal.
http://www.dealextreme.com/details.dx/sku.751

Offline Ro-Bot-X

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Re: Coin Cells
« Reply #3 on: January 13, 2009, 08:46:26 PM »
I got 20 2032 batteries (20mm 3v) for under 4 shipped here, best deal.
http://www.dealextreme.com/details.dx/sku.751


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Offline SmAsH

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Re: Coin Cells
« Reply #4 on: January 13, 2009, 09:04:21 PM »
well i got 50 2032's shipped here for $9.60 from ebay, so nanananana! but as everone else has been saying they dont provide enough mah for their size (plus theyre usially quite expensive!!) so its usially cheaper to get a couple of AA's or AAA's for the same price!
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Offline Admin

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Re: Coin Cells
« Reply #5 on: January 23, 2009, 06:06:11 AM »
At one time I was designing this ultra tiny robot for a DARPA project . . . here is some info on small batteries I gathered:
http://www.societyofrobots.com/robotforum/index.php?topic=1127.msg7406#msg7406

The project never left the design phase because it was easy to prove just using math that the whole concept wouldn't work. The major issue is traditional actuators are too weak in the micro size. Couldn't get high voltages with tiny batteries to power anything interesting for long periods of time . . .

Offline pomprockerTopic starter

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Re: Coin Cells
« Reply #6 on: January 23, 2009, 11:05:52 AM »
so using two of those 3v coin cells couldn't replace the NiMH pack on my $50 robot?

Offline frodo

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Re: Coin Cells
« Reply #7 on: January 23, 2009, 12:05:19 PM »
by the sounds of it, no.   :P
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Offline Razor Concepts

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Re: Coin Cells
« Reply #8 on: January 23, 2009, 12:40:59 PM »
You can use them but only two will mean that the batteries will die within a minute or so of running.

Offline Ro-Bot-X

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Re: Coin Cells
« Reply #9 on: January 23, 2009, 07:58:56 PM »
so using two of those 3v coin cells couldn't replace the NiMH pack on my $50 robot?

Use 3 of them to replace the 9V battery that powers the electronics, since the current for electroics is little compared to the current for motors.
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