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Alkaline AA batteries (LR6) - 3 pack : ID 3521 : $2.25 : Adafruit Industries, Unique & fun DIY electronics and kits
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Discharge tests and capacity measurement of 9 volt transistor radio batteries at high current, 100mA to 500mA engineering data
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batteries - Does a battery's voltage fall to 0 V when it has run out? - Electrical Engineering Stack Exchange
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Amazon.com: AA Batteries - USB Rechargeable Double A Lithium Batteries - Li-ion Battery Cell - 1.5V / 1700mAH (4-Pack) - Not NI-MH/NI-CD/Alkaline Batteries - ECO-Friendly and Recyclable - No Memory Effect :
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Calculate battery percentage of alkaline batteries using the voltage - Project Guidance - Arduino Forum
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