Lead Carbon

The application of the lead carbon battery is very specific.  It was designed for applications that require fast charging and are frequently partially charged.  In short,  use them only in cycling applications.  You can charge them at much higher rates to get them full faster.  Up to 4 times faster.  They can operate in a partial state of charge as long as they are fully charged at least every 10 cycles.

Do not use them for standby use.  IE UPS.  (when the battery is constantly on float charge) Not for this application. Here you want to use AGM.