13.99 at the battery is good but it needs to be tested under load eg headlights. If the battery is charged the drop can be acceptable in a faulty system. It will work but take twice as long to charge, leading to more likelyhood of a flat battery.
The weak link can be the crimp that goes to the starter and alternator from the battery terminal on both terminals. Traditionally this was lead moulded but now a mechanical crimp is used to attach the cable and the copper can corrode.
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