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Agree with the lithium battery. It will hold it's charge at approximately its nominal level until just before depletion whereas the lead acid will slowly but continuously decrease in voltage the entire time it's being used. It should also be much lighter than the deep cycle.
You might see decreased performance with accessories because even though the battery is rated at 12 volts, it will normally being getting charged from the alternator at the higher level between maybe 13.5 to 14.5 volts. Normally a fully charged battery should show between 12.6 and 13.2 volts on a volt meter.
Have you measured your voltage levels before and after yet? That would be useful information.
JJ
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