This discussion focuses on the process of discharging AAA batteries, specifically addressing the impact of discharge current on capacity. It highlights that a AAA alkaline battery can deliver approximately 1200mAh at low currents, but this capacity significantly decreases at higher currents, such as 400mA and 1A. The conversation also shifts to the use of NiMH batteries, particularly Eneloop, which maintain capacity better under increased discharge rates. Additionally, participants discuss measuring the true electromotive force (emf) of the battery during discharge and the challenges associated with obtaining accurate measurements.
PREREQUISITESThis discussion is beneficial for electrical engineers, battery researchers, hobbyists experimenting with battery performance, and anyone interested in optimizing battery discharge processes.
... pick a low capacity battery.How would I be able to discharge the battery at a 1A current so that I don't have to wait for a long period of time?
DrZoidberg said:You realize that the discharge current affects the capacity?
If it's discharged at just a few mA, a AAA alkaline battery can deliver around 1200mAh. However at a current of 400mA the capacity is only 400mAh and at 1A it will be even much less than that. That's why alkaline batteries are really bad for digital cameras.
http://data.energizer.com/PDFs/l92.pdf
Simon Bridge said:What do you mean by "true" emf?
I think you'll find that the open circuit emf is generally not of much interest. (Though maybe you have a niche application where it is.) You should check that you are required to plot the no-load voltage, as that would be unusual. Most common would be a plot of load voltage vs. time while the load current is maintained at some specified constant level.johnsmith12345 said:Well I need it so that I can get enough data about the open circuit emf to plot a discharge curve.