Amazon.com: ULTRALAST ULN423AAASL - 2/3 AAA (Two Thirds Triple A Battery) Solar Batteries for Outdoor Solar Lights - NICAD 1.2 Volt, 150mAh, Rechargeable Battery Pack for Garden Lighting - Recharges Up to
4 pack (1/3) AAA Rechargeable Batteries
Alkaline AAA batteries - 3 pack : ID 3520 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits