Here are some Hawker Datasheets and the Military TB
www.hawkeraplus.com
http://www.hawkeraplus.com/technical_information.htm
Single Battery Charging Procedures:
Use a constant voltage charger of newer technology, which may have multiple charge settings and steps (such as AGM setting).
If adjustable, the voltage should be set between 14.4 volts and 15.0 volts and there should be at least 10 amperes current available for charging. Do not use these values for the vehicle's voltage during regulator setting. Consult the appropriate Technical Manual.
If battery charger has no adjustments or switches and is not a SMART Charger (calculates at what voltage/amps the battery is to be charged) and output voltage is greater than 15.0 volts DC, the battery should be closely monitored (every 15 minutes) during the first two hours of charge process. If it shows signs of excessive heat when touching the exterior, leaking, or swelling during charge stage, charging should be stopped immediately.
Charge batteries for 12 hours or longer, and check the system at least once per day to assure proper operation. Severely depleted batteries (OCV less than 10 volts DC) can take a significant amount of time to recharge.
Battery is finished when charge current (ampere meter on charger) drops to less than 1 ampere and holds there for three hours. Automatic chargers will stop charging and give a screen reading of “Charge Complete.”
Proceed with Post-charge testing.
Post-Charge Testing:
Remove batteries from charger and allow them to settle (rest and cool, preferably overnight).
Test the Battery: Refer to TB 9-6140-252-13 for exact test methods/equipment.
When battery OCV is above 12.85 volts and load voltage exceeds 10.80 volts the battery is good for reissue to fleet, as is without need for recharging.
When the battery OCV and load voltage are below 12.85 volts and/or 10.80 volts respectively, battery needs additional charging.