I changed the battery in my 44-02 every 6 months whether it needed a new battery or not. I just set a reminder in my Calendar app. I've never had a battery die on me.Lakland Owners, what is the expected lifetime (in hours) for a 9 volt battery driving the LH3 preamp in a recent 55-02? Also, will the the preamp stop all at once when the battery dies, or will performance/volume degrade over time as the battery gets weaker? I'm putting several hours a day on my new axe, and curious if there will be an obvious moment when I know it's time to change the battery. Thanks!