LiitoKala 2/3 AA Rechargeable Battery 600mAh Ni-Cd nicd 1.2V Battery Batteries Blue - the more , the cheaper- - AliExpress
TLH-5955 - Tadiran 2/3 AA 3.6V Lithium Battery provided by AtBatt.com
Amazon.com: DURNERGY 12Pcs 2/3AA Size Batteries NIMH Rechargeable Battery 1.2V 650mah Button-Top Battery (0.59 * 1.18 inch, 2/3AA, Shorter Than AA and AAA) : Health & Household
CR2/3AA Varta Battery
Amazon.com: 8X Westinghouse 2/3 AA Ni-Mh Battery Batteries Rechargeable 1.2 V Volt 150 mAh Reusable Chargeable by JL Missouri Parts : Health & Household
Amazon.com: Odstore AA Ni-Cd 1.2V 2/3AA 600mAh Rechargeable Battery - 12pcs green : Health & Household
2/3 AAA NiMH Button Top Battery (200 mAh)
Battery Eliminator - 2 AA Battery Replacement - USB Powered
Tadiran TL-5955/S 3.6 v 1.3 ah Size 2/3AA # 15-5955-21500
Want to buy Lascar 2/3 AA Battery 3.6V? - Praxas - Praxas
3.6V 2/3AA Lithium Battery to +125°C - ThermoWorks
Replacement Lithium 2/3 AA | Onset's HOBO and InTemp Data Loggers