In support of published work.Data to be processed with open access code created by Elias Galiounas.Code repository contains instructions: https://github.com/EliasGaliounas/SonicBattContentsInvestigating whether state-of-charge estimation for a population of 7 batteries is possible using acoustic signals.The raw dataset is provided.Animations included: Acoustic signals obtained from multiple batteries during cycling. Includes time domain, frequency domain, and spectrograms.Trained machine learning models are provided.All data must be processed using the dedicated code repository created for this work, otherwise it is impossible to make sense of it.Battery chemistry: LiCoO2/Gr. Commercial, pouch cells.