I found a little more useful info. If you have a keyless fob (I do) you can switch off the lock or it spends all its energy alert to a signal from the fob. I never use the fob so turning it off is a good idea. Second, if you live where it gets cold, you should remove the batteries when you dewinterize. Third, lithium should last much longer and have been used successfully. Still odd that I got no warning before I could not lock the trailer. (Maybe you can still unlock after that; I have the key, I may check.)
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