AGM Battery Charging Setting With CTEK?

[Lethal Cover]

Hello all, I have replaced the factory Mopar batteries that died on me last fall with DieHard H7 AGM batteries with 850CCA each.

I use CTEK 7002 intelligent battery chargers for my other toys, which sit during the winter and keep them ready to go just fine.

My question is, since my new batteries are AGM if I were to charge my truck with the CTEK, should I use the "AGM MODE," which charges at a higher voltage (14+), or should I use the charger on its "Normal" setting?

The sticker under the hood of my truck says don't charge over 12 nominal volts.

I'm worried about frying the electronics if the voltage goes too high.

I plan on having a quick charge cable hidden in the wheel well.

Thank you for any input.

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[AK Bob]

Use the AGM setting.

The nominal voltage describes the system, but the operating voltage will vary.

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[inline6c]

I agree with Bob, although I don't fully understand the scientific part LOL (although I would like to)

In my mind, I think of hooking a battery charger up to it the same way as the alternator charging the battery when the vehicle is running.

The alternator supplies roughly 14.5 (+/-) volts.

I don't see your battery charger supplying any differently to charge your batteries.

But now you have me curious.

I wonder how the alternator knows whether you have a lead acid or AGM battery installed.

Sent from my moto g power 5G - 2023 using Tapatalk

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[AK Bob]

I agree with Bob, although I don't fully understand the scientific part LOL (although I would like to)

In my mind, I think of hooking a battery charger up to it the same way as the alternator charging the battery when the vehicle is running.

The alternator supplies roughly 14.5 (+/-) volts.

I don't see your battery charger supplying any differently to charge your batteries.

But now you have me curious.

I wonder how the alternator knows whether you have a lead acid or AGM battery installed.

Sent from my moto g power 5G - 2023 using Tapatalk

The Intelligent Battery Sensor (IBS) monitors the battery voltage and can determine the current flow in and out of the battery.

This information is sent to the PCM.

This is why it's important to disconnect all battery power from the IBS when replacing your batteries, so it can clear the history and learn the new batteries.

See the attached theory of operation for the IBS.

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