What is the battery life expectancy on a John Petrucci with piezo option?

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The battery life of course will vary depending on how much your guitar is plugged in. Whenever your guitar is plugged into either jack, the battery is under load. The average battery life is about 4 months for the player who practices every day for about an hour and gigs 1-2 times a week. One way to remember is: whenever the season changes - so should your battery.