I am looking to put LEDS in my textile samples I was just wandering if you had any ideas of batteries? I am going to use it in my degree show so it needs to be quite long lasting, perhaps re-chargeable and NOT TOO BULKY. It is going to be for fashion so it has to be wearable. If you know of anywhere that sells such a battery, please let me know!
Will you be using a LilyPad? If so, SparkFun makes a power unit that uses Lithium Polymer batteries which are pretty small and rechargable. Here is the link - LilyPad LiPower . Actually you could probably use this as a nice little power supply without hooking up to a LilyPad Arduino.