Functional design: International Standard universally compatible rechargeable Ni-Mh batteries which can be used straight from the pack without intial charging. Capacity:Best in Industry 325mAh 9V capacity batteries with 500+ charge cycles and no memory effect so they can be charged or discharged as needed without loss of capacity Discharge: Batteries are equiped with low self dicharge mechanism to hold charge upto 80% for 12 months without use Compatible with various devices like wireless microphones, toys, smoke detectors, and more Environment friendly:OSELTECH batteries provide you a safe and stable highy protected environment friendly energy solution