Ultralife U9VL-JPBP Long-Life 9V Lithium Battery

so far so good. time will tell how well they last

Outdoor garage keyless entry. 12 years too short. Will buy a different brand

this 'long life' aka 10 year battery purchased for a smoke detector. only had it a short while, so far so good. only reason rated just 3 stars is that it is nearly new and i have no indication yet how it will perform over the the long haul. of course won't wait years to update but will this time next year or sooner if it fails. that said a this point i am optimistic and do expect it to be a five star battery just have to wait and see. caveat most put up reviews as soon as they get their batteries i won't do that preferring to wait some to be accurate in what i put out for others to read.

It didn't work. I had to send it back and I bought the Energizer from Amazon. The Energizer works great and is cheaper too!!!

Works great in freeze alert

Ultralife once made two kinds of lithium 9v batteries. The U9VL and the U9VL-J, having a distinctive black and striped copper color motif.The U9VL had a plastic case and was designed for general use much like any other brand. Before being discontinued, it was sold individually in a sealed foil pouch as the U9VL-FP.Cased in sealed aluminum, the U9VL-J is the famous 10-Year smoke alarm battery. A sealed case keeps out humidity which is highly detrimental to lithium-manganese dioxide chemistry. Being a tad larger than zinc and alkaline 9v batteries, the U9VL-J sometimes failed to fit in small devices.The differences between the U9VL and the U9VL-J as well as the failure of sellers to differentiate such in their listings have been a source of frustration to buyers as to the product they received and its quality of service.The U9VL-J has been replaced by the "next generation" U9VL-J-P with a stainless steel case and a two-tone silver graphic. It is now a normal size as the three 3v cells inside are themselves each sealed. Improvements in chemistry have been implemented including reduced internal impedance and polymer separators which will shut down the battery if overheated.The U9VL-J-P is sold in these consumer packagings:U9VL-J-P-FP: the U9VL-J-P in a white foil pouch (sealed?) marked "5X Longer than Alkaline."U9VL-J-P-BP: the U9VL-J-P in a cardboard bubble pack, red and marked "5X Longer than Alkaline."U9VL-J-P-X: the U9VL-J-P in a cardboard bubble pack, red and marked "10 Year Smoke Alarm Battery."U9VL-J-P-10: a box of ten U9VL-J-Ps with each battery having a plastic cap on its terminals.(I added hyphens for clarity as well Ultralife marketed them that way in the past. They have since dropped the hyphens, i.e. U9VLJPX.)Other appended designations like BK and CP are for bulk and contractor packaging or like FP6, a six pack of the U9VL-J-P-FP.Retailers have other purchase options, of course, with up to 48 or 100 or 680 batteries in various states of packaging... just the battery, just the battery with a terminal cap, or the battery in the foil pack. Contractors, of course, order in much higher quantities. So, if you get a U9VLJP and it's not in a foil or bubble pack, the seller got theirs in bulk.

It's supposed to last 10 years. But until 10 years have passed, I can't really offer an opinion!

Imagine your surprise if you came home to hear beep ... beep ... beep. You follow the sound to your Master bedroom. The same room where you installed a brand new, long life 9V battery in your smoke detector less than 30 days before!That's what I came home to this afternoon. I have read other recent stories about this battery dying prematurely, but this takes the cake. I bought this battery for purposes of life safety. To make certain my smoke detector (which is only 3 years old) could be counted on to protect me. No such luck.I am going back to Duracells.Ps. Some other Amazon customers are reporting that these batteries are now being manufacured in China. Caveat emptor!