A short story of my experience in the last few weeks. It ends well, it's just to advise future buyers of used kit. I bought a used Reverend Gristlemaster from a UK store. Played it for a few days. Sounded and played great. Nice guitar and good value. One night the signal cut out a few times and then died. The red battery indicator light was flashing, indicating a pickup battery flat. I charged the rechargeable battery for the Fishman pickups via the USB cable. But the red flashing light wouldn't go out. I called the store. "Try charging it again and see how long the charge lasts". I did. Same thing. The store said they'd check with Reverend. They did. Reverend said to the store that they are not providing replacement rechargeable batteries or other replacements parts for the pickups. The store said that the batteries supplied by Fishman must be used with the Fishman pickups and, as they can't remedy via Reverend, the store has now arranged return at their expense and are refunding me.