Its an Alarm Battery and it does what it says,
Verified Purchase(What is this?)
This review is from: Yuasa NP2.1-12 - Valve regulated lead acid (12 warranty) (Personal Computers)
It's a lead-acid rechangeable battery that I use in my house burglar alarm. It does what it says on the box efficiently and well, and it didn't cost a lot. It's not in the least bit exciting, any more than any other lead-acid battery. My only suggestion is to mount it upright rather than lying down - I think that's what caused the old one to fail, but that's only a suggestion, I have'nt a shred of evidence to back it up.