These neoprene battery pouches are made to fit different kinds of common batteries. They turn out to be very useful when prototyping and competing a range of different projects, not necessarily just wearable ones.

Double AA battery pouch

>> Download Double AA Battery Pouch Stencil
This Pouch can hold either two AA batteries or one 9V battery.
>> Double AA or 9V Battery Pouch Instructable

Single AA Battery Pouch (Short Legs)

>> DownloadSingle AA Battery Pouch (short legs) Stencil
This holds one AA battery but can be connected with another one via the poppers at the end. This pouch can be made with short or long legs. Long legs are good for connecting to something else but short legs are good for connecting to one another.

Single AA Battery Pouch (Long Legs)

>> DownloadSingle AA Battery Pouch (long legs) Stencil

Triple AA Battery Pouch

>> Download Tripple AA Battery Pouch Stencil

3V Button Battery Pouch

>> Download3V Button Battery Pouch IMPROVED Stencil
>> Download3V Button Battery Pouch Stencil
This can hold one, two, or if you make it a bit looser, even three 3V button batteries. Button batteries are a wonderful shape and size for integrating in soft circuits, but they don’t last long in combination with conductive fabric traces, plus they are not rechargeable.



Previous version

9V Battery Pouch with 3.3V Regulator

This holds one 9V battery and regulates the voltage to 3.3V. It is useful if you are connecting to xbee or lilypad.
If you change the 3.3V Regulator (LD1117V33) to 5V Regulator (like LM7805), it can be used to provide 5V for your circuit. In that case, make sure that the pin configuration of your regulator is matching to the pouch arrangement. Check the datasheet of your regulator. For details of sewable 3.3V regulator, check this post.
The detailed construction plan and stencil PDF  is here.

Video of inserting two AA batteries and then one 9V battery into a Neoprene Battery Pouch