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It should be very quiet with the 6v. Also the pump at 6v should be trickling water in so don't expect a fire hose. A voltmeter will tell you how much voltage is coming out of the battery. Non lithium batteries will vary in output voltage depending on the battery and what kind of condition it's in. Odds are if the battery is good, at fully charged you will get at least 6 volts if not 7. As the battery drains somewhere below I think usually around 30% you will see voltage begin to drop and the pump will slow accordingly. Be sure the voltmeter is set to VDC 20V when you use it.
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