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I have a 97 saturn that will not stay running and the battery voltage

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Battery voltage high & drops low under load!

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A decrease in battery voltage causes the acid in the electrolyte to grow weaker, thus resulting in a constant reduction in the rate at which the fresh acid flows into the plates.

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Connecting a load to a battery often leads to a noticeable voltage drop, confusing many users. Understanding the underlying reasons for this behavior is in troubleshooting battery-related

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Battery Voltage drop | Thor Forums

Nor sure why there should be any drop in voltage when it is sitting in between trips . I guess I should have Mercedes check the battery that they installed if it continues to drop in

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I certainly recommend that you upgrade your battery bank; this may end up being required if, after a battery test, you discover that you need a new battery. So, in summary:

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What Makes Battery Voltage Drop?

High amperage loads such as the engine starter can cause so much voltage drop that the circuit no longer has power. Check the battery condition with a battery load tester.

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Low voltage in a small battery refers to a condition where the battery''s voltage drops below its optimal operating level, affecting its ability to deliver power effectively. This

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FAQs 6

Why does battery voltage drop with load?

The greater this (non-load) internal resistance the more the battery connection voltage will drop with as load increases. It's more common with lead acid batteries to see larger voltage drop with load as they have a higher internal resistance than lithium chemistry batteries.

Does a battery drop under load?

Dropping under load, however, is exactly how it works... when you apply a load to a battery, the voltage will drop. This behavior is significantly less when using an LFP battery, but still present - it's simply how a battery behaves.

Is a battery voltage drop real?

So, the voltage drop is real — the measured voltage is what your load gets. The more current it draws from the battery, the lower is voltage it gets. When the battery is open you are measuring an open cell voltage. When the battery is in the system it's closed cell voltage under load.

What happens if you remove a battery load?

When you remove the load, the voltage recovers quickly. But with lead acid or alkaline batteries, it may take a lot longer to recover to the final open-circuit voltage after removing the load. In other words, it is more complicated than a voltage source in series with a resistor.

Why does a battery drop voltage if it's open or closed?

When the battery is open you are measuring an open cell voltage. When the battery is in the system it's closed cell voltage under load. You are dropping some voltage across the internal impedance of the battery because your system is drawing current when the measurement is being made (so at the terminals the voltage is indeed lower).

What if battery voltage drops below 8 volts?

If the battery voltage drops below 8 Volts when placed under a high amp load, then it will need replaced. Another early test to conduct is the alternator charging voltage. This test is performed by using the 20 V DC range on your VOM to test voltage at the battery terminals as the engine is running. The voltage should be in the 13.5 -15 V range.

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