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Duralast Platinum AGM Battery H7-AGM Group Size 94R 850 CCA. ANy Good?

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Old Jul 30, 2021 | 09:36 PM
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2015 C300 4Matic Sport
Duralast Platinum AGM Battery H7-AGM Group Size 94R 850 CCA. ANy Good?

Winter is coming and my battery is showing signs of age. Can anyone attest to this battery quality and reliability or suggest another one.



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Old Jul 31, 2021 | 04:12 PM
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2018 C300 Sedan
Changed out the factory battery last month with one of these (H6 actually for my year). Working great so far, nice fast starts.
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Old Aug 1, 2021 | 12:34 AM
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This is the one I bought in January, works great so far. My stop / start function started working again after replacing my main battery.

Duracell Ultra Platinum AGM BCI Group 94R Car and Truck Battery
SLI94RAGM
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Old Aug 6, 2021 | 01:15 PM
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Originally Posted by mikec35
This is the one I bought in January, works great so far. My stop / start function started working again after replacing my main battery.

Duracell Ultra Platinum AGM BCI Group 94R Car and Truck Battery
SLI94RAGM
I love duracell!
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Old Aug 6, 2021 | 02:11 PM
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..

Last edited by Ron P Baker; Aug 6, 2021 at 02:22 PM.
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Old Aug 7, 2021 | 12:18 AM
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Installed the Duracell Ultra Platinum AGM BCI Group 94R Car and Truck Battery SLI94RAGM.

I got 10% ($22) off and $10 rebate, plus another $10 wen I return the core to batteries plus.

Thanks @mikec35

My ambient lights no longer flicker went starting. Hopefully, it also fixes the issue where audio cuts for a quick second went start/stop starts the car. (it didn't happen all the time but...)

I think it was my JL Fix 82, which has a 10 volt as minimum voltage requirement. Starting voltage would go down to 9.4volts on old battery.

Luckily my Helix V Twelve DSP can handle down to 6 volts.
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Old Aug 7, 2021 | 05:06 PM
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Originally Posted by benzdude
Installed the Duracell Ultra Platinum AGM BCI Group 94R Car and Truck Battery SLI94RAGM.

I got 10% ($22) off and $10 rebate, plus another $10 wen I return the core to batteries plus.

Thanks @mikec35

My ambient lights no longer flicker went starting. Hopefully, it also fixes the issue where audio cuts for a quick second went start/stop starts the car. (it didn't happen all the time but...)

I think it was my JL Fix 82, which has a 10 volt as minimum voltage requirement. Starting voltage would go down to 9.4volts on old battery.

Luckily my Helix V Twelve DSP can handle down to 6 volts.
If your aftermarket sound system cuts out briefly when at high volume and bass pumping, you might want to look into getting a 1 to 3 farad capacitor to store extra charge. Or installing 2nd battery in parallel works too in similar application.
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Old Aug 7, 2021 | 05:44 PM
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Originally Posted by stockbmw
If your aftermarket sound system cuts out briefly when at high volume and bass pumping, you might want to look into getting a 1 to 3 farad capacitor to store extra charge. Or installing 2nd battery in parallel works too in similar application.
Thanks. Looks like it was just an old battery.

When start/stop shuts of the engine (with music playing) the battery was having a hard time staying over 10.5 volts.

I guess my JL Audio fix 82 was losing power for a second while the car cranks. I monitored the voltage and lowest voltage drop was to 9.4 at restart.

Everything seems fine now. Still test driving. I also got a new voltage regulator just in case.

Not really worried, as the JL Fix 82 and OEM amp will be replaced by a Nav-TV Zen-M soon.

Less load on the battery.
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