I could kick myself. I let a friend of mine use my computer while I was out. She used it until the battery died. I plugged it in and now my wear level is at 5%. I have been using my replacement battery for about 2-3 weeks now and I have remained at 0% until tonight. 5% isn't really a lot but I figure it is going to take about 15 minutes off. This really stinks! Prior to letting it run down this far I had not taken it below about 38%. I didn't dare go much farther than that.