A cautionary tale: I have an Ovation mandolin with built in preamp. I never play plugged in but left the 9v battery in place, forgotten. Eventually I removed the battery, now leaking, and found that it had caused corrosion to run up the leads to the preamp. While I was investigating they snapped off at the amp end. There's no obvious way to remove the preamp to solder new leads on, if indeed the amp itself hasn't been damaged. It's not an instrument I usually play so haven't taken any further action. So, don't forget what's in your instruments!
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