A parallel connection means connecting the positive terminals together and the negative terminals together. This increases the battery capacity (Ah) while keeping the voltage the same.
A series connection means connecting the positive terminal of one battery to the negative terminal of another battery. This increases the voltage, while the capacity remains the same.
When connecting batteries in parallel or series, always use batteries from the same brand, with the same capacity and production date.
Need both higher voltage and higher capacity? Then batteries can be combined in both series and parallel configurations. In these systems, compensation cables can help balance voltage differences between battery strings for safe and efficient operation.