I needed to replace batteries in my solar deck lights. These were the best price available. I did some research and found for solar lights the NiMH type of rechargeable batteries provide twice the energy life than that of the NiCd rechargeable batteries. So I ordered 12 of these. They came packaged as sets of 4 and work as expected. They arrive already charged so there's no need to buy a charging unit. I'm pleased with these batteries and would order them again.