The first battery I had in it corroded up pretty good, but was my fault due to lack of maintenance. Check battery leads every time you fill it and all will be fine.
I have one and have had to replace a battery due to terminals corroding off. As mentioned above, keep them greased with dielectric grease and you can likely extend the life.
Other than that, I love the feeder. A stand and fill with the timer at more-or-less eye level is a great concept!
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