Cool, interactive, tutorial:


http://www.batterystuff.com/tutorial-interactive-battery.html

 

AGM cells are great but I still like my old flooded cells for solar applications where you need moderate power levels for long periods of time instead of peak bursts and I can test the SG directly cell by cell to see if the bank needs to be equalized (you normally can't do this to a AGM cell because you can't replace the electrolyte lost from gassing) as they grow older.

http://www.trojanbattery.com/BatteryMaintenance/Equalizing.aspx