My 8900 has a 3 stage charger.
The 8900 Series has revolutionized RV power centers with its lighter weight, decorative doors, and superior features. 8900 Series models provide a clean, constant 13.6 VDC output for reliable operation of electronics and appliances.
Automatic 3-Stage charging maintains the life of your batteries with output voltages of 13.2 VDC (Sleep) mode, 13.6 VDC nominal charge, and 14.4 VDC (Boost) charge. 8900 Series also maintain peace and quiet, as the cooling fan runs only when needed. When the fan is running, it is so quiet it goes unnoticed.