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<blockquote data-quote="audiolife" data-source="post: 7068074" data-attributes="member: 541383"><p>When you measure a battery just coming off a charge or from a running car it will have a higher voltage for a few hours, when you measure the batteries OCV you should wait a few hours after the charge/car was running. Also when your engine warms up the voltage from your alt should drop to the 13.8 to 14.4 range especially if it is a newer car. What is in your charging system? If you leave a battery undercharged from a system that pulls more than your alternator can keep up with&nbsp; then you are using the battery quite a bit and not allowing it to keep charged up it will drain. Leave a battery keep getting drained over and over it will sulfate (which happens to lead acid batteries when they discharge it is how they work) leave the battery in a low state of charge the sulfation will be harder to get rid of (recharging is a form of desulfation) if the sulfation is heavy and not crystallized you can recover it with a charger like a ctek 7002 if it is chrystallized the battery isn&#039;t recoverable. Then again if your alternator is always putting out 14.7+ to 15+ volts it can overcharge a battery as well.</p></blockquote><p></p>

[QUOTE="audiolife, post: 7068074, member: 541383"] When you measure a battery just coming off a charge or from a running car it will have a higher voltage for a few hours, when you measure the batteries OCV you should wait a few hours after the charge/car was running. Also when your engine warms up the voltage from your alt should drop to the 13.8 to 14.4 range especially if it is a newer car. What is in your charging system? If you leave a battery undercharged from a system that pulls more than your alternator can keep up with then you are using the battery quite a bit and not allowing it to keep charged up it will drain. Leave a battery keep getting drained over and over it will sulfate (which happens to lead acid batteries when they discharge it is how they work) leave the battery in a low state of charge the sulfation will be harder to get rid of (recharging is a form of desulfation) if the sulfation is heavy and not crystallized you can recover it with a charger like a ctek 7002 if it is chrystallized the battery isn't recoverable. Then again if your alternator is always putting out 14.7+ to 15+ volts it can overcharge a battery as well. [/QUOTE]

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