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Interconnecting Two 9 Volt BatteriesWhat happens "when hooking 2 9 volt batteries together" depends on HOW they are connected together.

IF you connect the Negative terminals together, AND the Positive terminals together, then nothing happens other than creating a 9 volt battery capable of providing twice the current [measured in Milliamps (mA), or Amps (A)].

On the other hand, IF the batteries are connected with the Positive terminals to the Negative terminals of the other, THEN you will have created a very serious and possibly hazardous condition!!!!!

When connected in this manner, the full current of both batteries flows, basically a full short circuit condition, and both batteries will very quickly heat up to the point of self destruction, and very likely to explode.

Even it they do not explode, they will certainly become hot enough to severely burn you, and start a fire if they are in near proximity to anything combustible.

Therefore, DO NOT interconnect any batteries, with both of their Positive terminals to the other's Negative without a load [electricity using device within the the circuit] to limit the current flow.

If you connect the positive terminal of one battery to the negative terminal of the other and then put the load between the remaining positive and negative terminals on each battery you then have an 18 V battery. This is connecting the batteries in series.

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