The reality is that no 6 volt battery is exactly 6 volts and no 12 volt battery is exactly 12 volts. Therefore, all you have done is connected nine 2 volt cells together to get 18 volts … so what’s the problem? A 6 volt battery is often three 2 volt cells and a 12 volt battery is usually six 2 volt cells. In theory, a 6 volt 5 Ah battery and a 12 volt 5 Ah battery connected in series will give a supply of 18 volts (6 volts + 12 volts) and 5 Ah. This is where most tutorials end, but what happens if you wire batteries of different voltages and amp hour capacities together? Most people simply answer by telling you “Don’t do it!” … but why not? Connecting batteries of different voltages in series As in the diagram above, two 6 volt 4.5 ah batteries wired in series are capable of providing 12 volts (6 volts + 6 volts) and 4.5 amp hours. The basic concept when connecting in series is that you add the voltages of the batteries together, but the amp hour capacity remains the same. Connecting in series increases voltage only For more information on wiring in parallel see Connecting batteries in parallel or our article on building battery banks. This article deals with issues surrounding wiring in series (i.e. Different wiring configurations give us different voltages or amp hour capacities. In the graphics we’ve used sealed lead acid batteries but the concepts of how units are connected is true of all battery types. The illustrations below show how these set wiring variations can produce different voltage and amp hour outputs. There are two ways to wire batteries together, parallel and series.
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