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There is no answer to this question. It could be anywhere between 2.5V and 12V. If you connected them in series the answer would be 20.5V, in parallel the higher voltage battery will discharge into the lower rated cells, the resultant voltage is dependent upon the internal resistance of each of the batteries. In practice you wouldn't do this, so it's either a mistake or trick question. www.powerinspired.co.uk

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14y ago
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13y ago

When you connect the three batteries together you will have a circuit with current. The final voltage across the connection point(s) will be some value which you can't calculate unless you know the internal resistances of the batteries. If you actually do this you should be carefull because the currents can get quite high, causing vapour pressure in the batteries and possibly cause a battery to explode .

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9y ago

6V, for ideal batteries of course. Be careful though as some real types of battery do not tolerate being connected in parallel and can burst, catch fire, or even explode.

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Q: What is the total voltage if a 12v battery 6v battery and 2.5v battery are connected in parallel?
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