I have 2 ultras. I don't have batteries in then.
I just play in passive mode. I use the active/passive switch as a mute switch.
Sorry, I have no idea what the battery life is on my Ultra jazz and p are.
My buddy picked up the countertop bass. I had it in my hands tonight. The thing sounded sweet.
Amazed at how light it was. Also strung with flatwounds.