MK Sealed PV/Solar Batteries MK sealed batteries are designed for maintenance free operation for the life of the battery. Sealed construction eliminates periodic watering, corrosive acid fumes and spills. Tank formed plates ensure voltage matching between cells. They are all rated non-spillable by ICAO, IATA, and DOT, which means easy transportation by air and no special containers are needed. 1 year warranty. Sealed Gel Batteries The gelled electrolyte wont stratify, so no equalization charging is required. Less than 2% per month standby loss means low discharge during transport and storage. Gel batteries are best for cycling operations and where very cold temperatures are expected. They can operate at temperatures from -76 to 140 F. Sealed AGM Batteries These are completely sealed, absorbed glass mat, valve regulated batteries with efficient recombination. They are UL recognized components to UL standard MH17218. AGM batteries are recommended for battery backup standby power systems where batteries are in float service with occassional deep discharges. They can operate at temperatures from -40 to 140 F. Delivery is easy from one of 20 MK warehouses all across the US. | 
