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How long do batteries last in your bass

My main bass has a 9V for the pre and a 3V for the LED's in the fingerboard. The latter is replaced when dead - that happens about every 18 months. First the blue LED goes but i can go on with the red for a few weeks, then it's dead. The 9V lasts more than a year, but i happen to replace it before a gig when it's about a year old, so there are no nasty surprises on stage.
 
The batteries last many months, years even in some of my basses - as long as I remember unplugging them between uses. I probably replace the batteries too early, just to be safe, and I have only had a battery go dead once, at a rehearsal luckily.