I assume you're talking about an electrical circuit and batteries. In that case, yes, the positive terminal of one battery cell should be connected to the negative terminal of another battery  cell. 

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It should be connected because if not connected ... the circuit will be broken and hence the current will not flow therefore it is compulsory to join the positive terminal with the negative terminal for current......
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if we make an electric circuit then its important to attach positive (+)terminal to negative(-)terminal because when the electricity flows through a circuit it always passes from (+) terminal to (-)terminal.....hence its imp to join them so that the circuit can be complete and the  energy (electric energy) can flow through it.
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