Is this still able to be battery powered? The reference O2 design can be powered off of 2 9v batteries, but the warning on the back of the unit that says "no user serviceable parts inside" seems to suggest that this variant does not have that capability.

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cgouy
23
May 18, 2020
The amp is produced under the creative commons licence, so by law, they have to manufacture it the way it is designed. The specs section also mentioned that battery powered is an option. I have joined this drop with the intention use as a portable amp. It is recommended to use 9V nimh rechargeable batteries.