Hi Guys, I bought a new Li-ion battery for my Thinkpad X31 today. It's an IBM factory original battery. After I got home and started using it I noticed it was manufactured in March of 2004. It is 3.5 years old!! My understanding of Li-ion batteries is that they do lose efficacy over time, even if not in use. I've seen sites suggest that you should not buy old batteries for this reason. Anyway, after the first charge, my laptop battery utility showed that its capacity was up to specifications. (However, the same utility showed the "Battery Wear" already at 5%.) I'm worried it will wear out faster than it should because it's so old. Is there any way to test this, or do you think I should just try to return it immediately? Again, this is a Li-ion battery, not a Nicad or other. It's rated at 10.8V 4.4AH. Many Thanks!