3 x AAA Battery Holder with On/Off Switch and 2-Pin JST : ID 727 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Replacement Battery for Universal AAA x 3 AAA x 3 (700mAh) : Health & Household
Amazon.com: Kastar 3 Pack 1/3 AAA 170mAh Button Top NiMH Battery Replacement for Solar Lights Battery, Outdoor Solar Garden Art Light Battery, 1/3AAA-150NM-NT, GP-17AAAH, GP17AAAH, Sanyo N-50AAA, GP 1/3AAA-170NM : Health &