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2 x AA Battery Holder with On/Off Switch & JST PH Connector : ID 4193 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Verico LoopEnergy USB-C AAA battery (rechargeable) Li-ion 600 mAh 1.5 V 4 pc(s) | Conrad.com
1/2/3/4 Slot AA Battery Case 1.5V/3V/4.5V/6V AA Battery Holder Box AA Storage Case With Cable - AliExpress
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Battery Holder for 4x 18650 Batteries, SMD Style
Hixon AA Size Button Top 3500mWh 1.5V 4 Pack Battery Kit – Liion Wholesale Batteries