Hi guys,
I run out of space (available: diameter 40mm and height 3mm) on my project, I'm looking for a coin battery that have a big power more than 1000mAh.
Based on my search it's look like those on coin battery do not exist yet.
If you do not know any coin battery that satisfy my requirements, do you know any lithium battery then?
Thanks
A 504045 Lipo is close to your size requirements
yeah close 
, but little bit too much big. The diagonal will exceed far 4mm.
And why i do not see any circular and flat lithium battery any where? Why only rectangular?
there's the LIR2032. ~50mAh, though...
more than 1000mAh.
Let's see. At a nominal 3.7V (for Li-ion) , that'd be about 3.7Wh, right?
40mm x 3mm - that's about 0.004 liters, so you'd need about 925 Wh/l volumetric capacity. That's about twice the best commercially available Li-ion batteries.
Zinc/Air batteries can achieve that sort of energy density (at least theoretically), but they're not rechargeable, you'd need three to get a reasonable voltage, and I don't see any geometries that match your requirement
Sometimes you have to modify the project to accomodate reality.
That's what I will end up to do even it will destroy all my design 
Hi westfw, thanks for your answer. I like the voltage of the LIR2032. Is it 50mAh the max we can get?
When googeling we fing a lot those woldest small battery which we can not buy anywhere probably because in experimentation stage or stuff like that. But propably 10 years ago we should have those same kind of result. So we still not able to but those ? Low price of course 
.
Is it a 'design' if its not possible ?
Professional product designers take all the various required bits of information, like battery size, shape and lifetime into account, before they decide on an enclosure.
Amateurs often start with the enclosure and then discover that it is not big enough or the wrong shape. That is fine for a personal hobby project.
Tadaa! I'm super amateur boy 
Appreciated all professional advices.
Thanks guys.
Hey guys, here is another one pretty close: https://www.lithium-polymer-battery.net/round-lithium-polymer-battery-2/
If you could find a place that sells them in small quantities, you could get about 1/4 the capacity you were hoping for (35mm*3mm), assuming that the quoted capacities aren't just wishful thinking (which appears to be a frequent problem with non-brand-name LiPoly cells.)
Even if the stated capacities on the round LiPo batteries are correct, those > 1000 mAh all exceed the dimensions given above by quite a bit.
Yeah I will do some search to see what i can get and maybe sacrifice few capacity.
About the reliability I will probably cross my finger.
Yes you are right, I may make a little modification. But still thinking the best choice to made.
Please let us know if you are able to buy them in small quantities, and if the stated capacity is reasonably accurate.
Ok will give feedback if and when I test them.
Thanks
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