Kastar 5-PACK AAAX2 2.4V 1000mAh 5264 Ni-MH Rechargeable Battery for BT-166342 BT-266342 BT-283342 AT&T EL51100 EL51200 EL51250 EL52200 EL52210 EL52250 EL52300 EL52350 EL52400 EL52450 EL52500 EL52510 Super capacity - No longer to worry about the endurance of the batteries, Kastar 1000mAh will provide ultra strong power for your devices to performance well and operate longer. 1200 Cycle - Kastar add mix-protection additive to the cathode of batteries, protect the material from degradation in the progress of charge and discharge, extend lifespan up to 1200 cycles. Low self-discharge - Embedded seal structure expand the space of crystal lattice, make more room for hydrogen, so Kastar batteries will holds power longer than others. Safety assurance - Ni-MH eco-friendly cell, doesn't contain Hg/Cd/Pb, makes no pollution to the environment, and using DBCK steel shell which can protect the battery against explosion due to overpressure. Long warranty - Kastar batteries include 30-day Money Back and 3-YEAR Manufacturer Warranty.