hey whats up guys and gals Heres the deal. I have a spector 4 string with the 9 volt electronics. Its a p neck and jazz bridge setup. I'm not sure how old the bass is but i dont think the battery has ever been changed. I bought it used. The battery in the bass looks like a battery from an orignal instrument. Ive had the bass for about a year now, how long are these batteries supposed to last? Thanks.