The PRO Charging Systems Sentinel 10 Charger is a 12v 10-bank charger maintainer that is manufactured in the USA. Each bank of the Sentinel 10 is independently controlled and offers 500 mA per bank. The unit is designed to keep fully charged AGM and Flooded batteries topped off and ready to go! Pro Charging Systems recommends this charger to those wanting to maintain the charge on a fully charged battery up to a group size 31 battery or approximately 120 AH per bank. For cycle charging discharged batteries, we would recommend limiting the battery size to 10 AH or less per bank. The S10 is an ideal charger and maintainer for automotive shops, car dealerships, salvage yards, and businesses that need to keep multiple batteries fully charged and ready to go.