Amazon.com: Panasonic HHR-75AAA/B-4 Ni-MH Rechargeable Battery for Cordless Phones, 700 mAh (Pack of 2) : Electronics
Comparing li-ion vs ni-mh battery which is better choice-Tycorun Batteries
Harbor Breeze Aa 1.2-Volt Rechargeable Nickel Metal Hydride (Nimh) Landscape Lighting Batteries in the Landscape Lighting Batteries department at Lowes.com