Easy to find the type of replacement batteries I need for my alarm system sensors. My alarm system technician uses the same Tenergy batteries I purchased; they last a really long time; and they fit perfectly in my sensor units. Since I live in a rural area, no one near me carries the exact type I need to replace the original batteries. Plus, I was not only able to find the type I need, but I was also able to select the quantity I wanted--from only 1 on up. I opted for the 16-count package, since most of my sensors are close to needing battery replacements. I appreciate that Tenergy sells to individuals. Check out was easy. Shipping was prompt. I will definitely look to Tenergy first for my battery needs going forward.