I used this to replace the backup battery of my alarm system. My alarm system company wanted $70 for a service visit plus $40 for the battery. This battery is the same brand that they use and is as easy to change as the AA battery in your typical flashlight. It charged quickly and has worked perfectly since installation. As for those who are reporting problems with other sellers, I ordered mine from a company called Cream City Hobbies and the battery was Interstate, exactly as described. I no longer see them listed as an Amazon seller and cant vouch for the other sellers listed.