Here are a couple of quotes from manufacturers:
The charging voltages are the same as for any standard battery — no
need for any special adjustments or problems with incompatible chargers
or charge controls. And, since the internal resistance is extremely low,
there is almost no heating of the battery even under heavy charge and
discharge currents. The Concorde (and most AGM) batteries have no charge
or discharge current limits.
The AGM battery has an extremely low internal electrical resistance. This, combined
with faster acid migration, allows the AGM batteries to deliver and absorb higher rates of
amperage than other sealed batteries during discharging and charging. In addition, AGM
technology batteries can be charged at normal lead-acid regulated charging voltages,
therefore, it is not necessary to recalibrate charging systems or purchase special chargers.
Also,
You may find these links of interest:
LIFELINE BATTERY OWNER’S MANUAL
LIFELINE DEEP CYCLE PREMIUM SEALED RV BATTERIES
Original Equipment OEM Manufacturers
LIFELINE SAFETY BULLETIN (outgassing info)