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DURACELL Rechargeable Battery: Nickel-Metal Hydride, 1.2V DC, AA Battery Size, 4 PK - 21LN85|DX1500R4 - Grainger
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Some battery powered gadgets require 2 AA batteries, some 4 AA batteries, and some require AAA batteries instead. How do they determine what type of battery is required and how much voltage
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