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so it says battery not included? where can we get one?
Any 9v NiMH will do (Don’t buy NiCads, don’t buy Lithium, they are not designed to be properly recharged by the O2’s internal circuits, the O2 was designed in 2012 and lithium 9v batteries were not widely available at the time, so the O2‘s recharging circuits were designed for NIMH 9v batteries). You can get then on Ebay or Amazon. You need 2 of them (this is why the amp is called the Objective 2...)