A capacitor-assisted battery module includes a housing, a positive terminal, a negative terminal, one or more capacitor-assisted battery cells and one or more first switches. The one or more capacitor-assisted battery cells are disposed in the housing and include one or more battery terminals and one or more capacitor terminals. The one or more battery terminals are connected to battery electrodes. The one or more capacitor terminals are connected to capacitor electrodes. At least one of the one or more battery terminals and the capacitor terminals is connected to the negative terminal. One or more first switches is configured to connect the one or more capacitor terminals to the positive terminal. An overall voltage of the capacitor assisted battery module is measured across the positive terminal and the negative terminal.