Related Experiment Video
Updated: Apr 12, 2026

Archimedes-Based Glycerol Displacement for Electrode Porosity Measurement in Lead-Acid Batteries
Published on: April 7, 2026
Performance analysis of ten brands of batteries for hearing aids
Silvio Pires Penteado1, Ricardo Ferreira Bento2
1Electronic Engineer, PhD in Medical Science. Department of Otorhinolaryngology, University of São Paulo School of Medicine, São Paulo, Brazil.
Introduction:
Comparison of the performance of hearing instrument batteries from various manufacturers can enable otologists, audiologists, or final consumers to select the best products, maximizing the use of these materials.
Aim:
To analyze the performance of ten brands of batteries for hearing aids available in the Brazilian marketplace.
Methods:
Hearing aid batteries in four sizes were acquired from ten manufacturers and subjected to the same test conditions in an acoustic laboratory.
Results:
The results obtained in the laboratory contrasted with the values reported by manufacturers highlighted significant discrepancies, besides the fact that certain brands in certain sizes perform better on some tests, but does not indicate which brand is the best in all sizes.
Conclusions:
It was possible to investigate the performance of ten brands of hearing aid batteries and describe the procedures to be followed for leakage, accidental intake, and disposal.
Related Concept Videos
Batteries and Fuel Cells
Power Dissipated in a Circuit: Problem Solving
The simplest combinations of resistors are series and parallel connections. In a series circuit, the first resistor's output current flows into the second resistor's input; therefore, each resistor's current is the same. Thus, the equivalent resistance is the algebraic sum of the resistances. The current through the circuit can be found from Ohm's law and is equal to the...
Multiple Voltage Sources
In series, the positive terminal of one battery is connected to the negative terminal of another battery. Hence, the voltage of each battery is added to give the net voltage, which is increased because each battery boosts the electrons that enter it. The same current flows through each battery because they are connected in series.
Batteries are...

