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Don't just replace the battery until you have it load tested. Dropping to 7 Volts when cranking is a problem. The battery may be able to take a surface charge but is failing to take a deep charge which would indicate a bad battery.
Check your battery terminals first, one that is loose can cause a single click, there should be no corrosion, if there is, clean it up and tighten the terminals down. There can be no slack or looseness in the terminals. Also, if you have aftermarket terminals- especially the lead thick ones that are painted black and red- you can have connection issues because that paint is not conductive.
A single hard click is either a bad battery terminal connection (which needs to be fixed because it'll damage your alternator in time) or more likely a bad starter.
Many clicks usually means that the battery is either weak and has low CCA, or is partially discharged and lacks the voltage to start the engine.
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