The cell chemistry is LiFePO4 (Lithium Iron Phosphate) which is the leading chemistry for home storage.  Each battery works with 48V equipment but is technically 51.2V nominal, 100Ah.  This means you have 5.12kWh of capacity.  

I run through a series of tests and was happy with it's outcome.  Yes, I was able to overload and shut down the battery, but that was pushing it past it's 100A rating.  When staying below 100A, the battery worked as advertised.  

This is an excellent choice for small off grid solar systems where you don't need a full rack of batteries taking up floor space.  Mounting a few of these on the wall will likely make for a cleaner installation on small off grid builds