In a battery creating a circuit between positive and negative terminals creates a flow of electrons. If possible batteries should be recycled, thus avoiding the need for disposal to landfill.

Lead-acid batteries, where they are found in end of life vehicles, increase the scrap value of the content, and are an example of batteries which are easy to recycle. However the large overall variation in size and type of batteries makes recycling more difficult and requires sorting facilities to assimilate similar kinds into batches. Batteries have a rated capacity abbreviated as "C" and measured in amp-hours (Ah). It is usually measured at a discharge rate of C/10 at 20°C. (the capacity being dependent upon the discharge rate and temperature). For example a battery with a capacity of 5 Ah can supply 250 mA for 20 hours before dropping below its rated voltage.

SizeZinc Carbon AhAlkaline Ah
D1.517
C1.07.8
AA0.182.6
AAA0.070.57

Amazon Books
Image of Used Battery Collection and Recycling (Industrial Chemistry Library)
Author: S.P. Wolsky, J.-P. Wiaux, G. Pistoia
Publisher: Elsevier Science (2001)
Binding: Hardcover, 384 pages