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You might want to cross-post on one of the micro-flyer forums, since they are the guys driving these tiny Li-Poly batteries.
so do you have a maximum length requirement?
AAA batteries are definitely less then 1cm round and you can get rechargeable ones.
Anyway, apparently the watch battery number CR927 has dimensions of 9.5mm x 2.7mm. I found one that is rated for 150mAh at 3V, and is a rechargeable lithium!
Ok now I need a tiny tiny battery to power everything . . . I can put many in series so power isnt the issue, but width/height both must be under 1cm.The closest I can find is this guy:http://www.powerstream.com/ultra-light.htmUnfortunately it measures 1.5cm x 1.5cm which is way too big Voltage should be around 3.6V so I can power the microcontroller . . . suggestions?
Hi,Too bad Fairchild discontinued their, relatively young, ACE microcontroller family - since they had seriously small outlines like can be seen http://d116.com/ace/.Actually, it's still possible to get some of the family members, so if you need ultra small, might be worth a look.For a small battery, zinc-air button cells are pretty impressive primary cells - The largest is a P675, which is the exact size of an AG10 button cell (the size used in many LASER pointers and what not), but with a capacity ranging from 600 mAh to 680 mAh (differs between manufacturers).However, zinc-air has to be used within a month or two from when they are "primed" with air (by removing the adhesive tab on the back, exposing tiny holes for the air) - and no, re-taping an allready primed cell won't change that.Hey, I'm getting "naughty" ideas while writing this, since I throw away dozens of good cells regularly, some just because they're close to their expiry date - why not make a couple of tiny desktop robots/battery exhausters - I'm sure the kids among my patients would like such a scenario