I purchased 8 of these Molicel P30-B's. While 6 of the batteries are great and last a long time, unfortunately it does seem 2 of the batteries come degraded as they charge fine, but lose power significantly faster than the others. This seems to be a rare occurrence as I've purchased many Molicel batteries from IMR in the past and have never have any troubles. Molicel and IMR are really the only way to go when you need rechargeable batteries.