As with all gelled and sealed units, AGM batteries are sensitive to overcharging. A charge to 2.40V/cell (and higher) is fine; however, the float charge should be reduced to between 2.25 and 2.30V/cell (summer temperatures may require lower voltages).
Charging. Here are a couple of things to keep in mind when maintaining your Absorbent Glass Mat (AGM) battery, including an OPTIMAÂ® battery. Many newer
Batteries will self-discharge over a period of months even without a load. Many GEL, AGM and Calcium's are better than regular lead-acid batteries but even so you should charge them back up regularly, or better still use a trickle charger (or solar panel) to keep them in top condition and extend their life.
General charging information for AGM and GEL batteries. Only charge GEL batteries using a confirmed and reliable, temperature sensing, voltage regulated charger. Charging Current or Amps is the flow of electricity. At 25Â°C/77Â°F keep charging current in the range of 2.38 volts to 2.42 volts per cell for GEL cell.
Some have different settings for charging flooded, gel and AGM batteries. Overcharging can kill these batteries. Also, alternators are not chargers. Don't rely on .