CamiaReceived the O2 last week and connected it to my Fire Kindle for AKG K702. Sounds great! But now am curious with putting in the battery inside O2 to make it truly portable. Is this an easy fix or dangerous? Can we have it done by someone from the group here?
Hohdude"The" battery is actually 2 9 volt units, and they must be nimh rechargeable. I am using a couple of Tenergy batteries and they work fine. To open the case you need a very small phillips screwdriver to remove the 4 screws in the front of the unit. Be very careful to not strip them if they are hard to get started. Buy a suitable screwdriver if you don't have one. If you strip the screws you will not get the case open.
Once the batteries are installed the unit will slide together again, but be a little tighter.