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If you connect positive to positive and negative to negative you will have a 9V battery with twice the current capacity in milliampere hrs than a single batteries. The load then goes between positive and negative paralleled terminals.

If you connect one negative of one battery to one positive of the other battery and put the load between the remaining negative and positive terminals you have created an 18 V battery with the same milliampere hr rating as a single battery.

If you connect one negative to positive of other battery and the negative of that battery to the positive of the first battery then both batteries with quickly drain and get hot in the process. Contrary to folklore or urban lefends, they do not explode.

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Q: What happens when you stick two 9 volt batteries together?
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