FAQs: Tips

Connecting Batteries Together in Parallel

If your battery application requires more starting power or reserve capacity, you can install multiple batteries together in parallel by connecting the like terminals together (positive to positive / negative to negative). Each time you add a battery in parallel you increase the CCA and Reserve Capacity (the voltage remains at 12 volts). For example, two OPTIMA 34/78's in parallel will provide 1600 CCA and 208 minutes reserve. Three in parallel provides 2400 CCA and 312 minutes of reserve. If you have any questions about multiple battery installations, contact an appropriate automotive service center.

Suggestions For Connecting Batteries in Parallel

• Use batteries of identical make, model, and age
• Make sure cable gauge is sufficient to handle the higher current flow
• Prevent cables from shorting (do not allow them to rub against the vehicle body)
• Use only high quality connectors and clean all contacts prior to installation
• Periodically check all connections for snugness
• If you are unsure of this procedure, contact your automotive service center

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