coin cell battery search

[frank]

Hello,

I am looking for a coin cell 1.55V/1.5V battery that can source 10mA
of steady current. I did a copernic search, but i could not seem to
locate one.
Are there any 10mA coin cell batteries out there?
CAn anyone recommend any such batteries.

Actually, I was originally searching for was a typical coin cell
battery internal impedance. Also, for the battery voltage vs. time,
discahrge curve. Than i discovered i could not find a battery.

Any info would really be appreciated.
Thx
-Frank

 

[Joerg]

Hi Frank,

That'll be a bit tough. There are reasons for low current capability.
One is that the market is mostly low current, such as watches, memory
backup etc. The other is liability. The mfg doesn't want it do get hot
or explode if shorted.

Best is to talk about it with a major manufacturer such as Duracell or
Rayovac.

Regards, Joerg

 

[John Fields]

Hello,

I am looking for a coin cell 1.55V/1.5V battery that can source 10mA
of steady current. I did a copernic search, but i could not seem to
locate one.
Are there any 10mA coin cell batteries out there?
CAn anyone recommend any such batteries.

Actually, I was originally searching for was a typical coin cell
battery internal impedance. Also, for the battery voltage vs. time,
discahrge curve. Than i discovered i could not find a battery.

---
I think Panasonic's got about as broad a line as anyone, and according
to the data sheets here:

http://www.panasonic.com/industrial/battery/oem/chem/lith/coin1.htm

you may be in luck, since the huge 1000mAH CR2477 looks like it can
sustain 10mA out for a while...

Call Panasonic, though, to make sure it won't blow up.

 

[Rich Grise]

---
I think Panasonic's got about as broad a line as anyone, and according
to the data sheets here:

http://www.panasonic.com/industrial/battery/oem/chem/lith/coin1.htm

you may be in luck, since the huge 1000mAH CR2477 looks like it can
sustain 10mA out for a while...

Call Panasonic, though, to make sure it won't blow up.

WHat am I missing here? Shouldn't almost _any_ battery be capable
of providing 10 mA? That's hardly any current at all.

Confused again,
Rich

 

[Joerg]

Hi Rich,

Not the coin cells. There is a liability issue here (shorts etc.) and most
applications do not call for much power. Think watches, timer backup,
calculators, memory retention, keyless entry. All that is usually under one
milliamp, and some is just a few microamps.

So they are designed to be weak. Most drop down several hundred millivolts
even with a few mA of load.

The other issue is that these cells have so little capacity. It makes no
sense to use them in high power applications unless it was a very
intermittent purpose. When it comes to really short bursts a capacitor can
handle that.

Regards, Joerg

 

[Ian Stirling]

Hi Rich,

Not the coin cells. There is a liability issue here (shorts etc.) and most
applications do not call for much power. Think watches, timer backup,
calculators, memory retention, keyless entry. All that is usually under one
milliamp, and some is just a few microamps.

So they are designed to be weak. Most drop down several hundred millivolts
even with a few mA of load.

Also, generally speaking, things you do to increase the current capacity
of a cell often cause increased internal leakage.