OutBack Power's EnergyCell PLR batteries are designed for residential, light-commercial grid-tied backup or off-grid renewable energy power demends. with 1,500 cycles at 50% DOD, pure lead extends the life of the battery versus traditional VRLA and allos for increased float capability and maximizes runtime for backup applications.Batteries designed for residential, light-commercial grid-tied backup or off-grid renewable energy power demands.Easy to install and maintain:PLR technology means 99% gas recombination efficient, no periodic watering of cells, no re-torquing of terminal connections, and no equalization charge under stanadard operation conditions