I have a heated vest made out of 50.4% polyester, 45% cotton and 4.6% other fibers, so hopefully you can track it with the Lot# MVFXBT1110802727. Well, my original battery could no longer handle a charge, so I contacted you and was directed to purchase a replacement battery; model MINI 5K 2INR22/71, just in case you need to look it up!! Well, I fully charged it before using, like the directions said, and when it was turned-on, it turned itself off in about a min. So, I put it back on the charger and the 4 lights quickly lite up, so trying it again in the vest, it turned off in a shorter time frame, like seconds. Your product has been a great buy, but the key technology, battery-powered heat, doesn't work like the original. Thanks for allowing me to vent...