“I've been using 21st Century for a few years and lately these are the worst batteries ever. Lucky if they even last a month. I have one battery from about a year ago that still works unlike the recent ones. I have even received some of the chargers where the battery will not screw in to them. I am assuming that you have a new supplier.”
“My only issue with this product is that the battery charger insert will not allow the battery to screw in! My hope was to have a new one with each of the 3 rechargeable kits I just purchased along with 3 cartons of filters 90 6 packs each.”
