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So I changed my battery today

PC_GUARD

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Everything always been fine. I had the car serviced last week and they did a load test and it was into the 4's somewhere and I blew them off. Today I opted to go to the dealer and buy a battery. I had a coupon where they almost gave me the thing, so why not. I took the batter home put it on the charger until it was full, and did the swap.

Discharged everything, cleaned everything up, dielectric greased the posts and bolted it up.


Turns out i had a lot of voltage issues that I was unaware of. I never had any codes besides cat inefficiency, but nothing else. I had posted a thread a couple weeks back about cam position sensors, because my car has always "stepped" or kinda accelerated oddly, regardless of tune, or mods, always kinda the same.

Well, all that is gone and the car absolutely rips now.


Does anyone have any idea why low battery or poor battery health have to do with how the car pulls? Idle is better (after I let it idle for about 20 minutes after the swap) and it runs much stronger.
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Linkster1666

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Damn near EVERTHING on these cars is electric. Not enough voltage, injectors, sensors and everything else works poorly. No, the alternator doesn't have the balls to run anything but trickle the battery.

Put a high watt amp in and watch her fall flat on her face if the music is loud.
 
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PC_GUARD

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Damn near EVERTHING on these cars is electric. Not enough voltage, injectors, sensors and everything else works poorly. No, the alternator doesn't have the balls to run anything but trickle the battery.

Put a high watt amp in and watch her fall flat on her face if the music is loud.
Odd it never coded, just wasn't as smooth or crisp. I dont know anyone local with an s550, so I gave no comparison.
 
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PC_GUARD

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You got a free KAM reset :like:

WD :like:
I agree Kam reset is a part, but other issues like the random tb flap ticking at idle is gone.

Then obvious things like charging 2 cell phones at once works lol
 

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ORRadtech

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Did you do the battery relearn thing? Modern cars track the battery age/performance and should be told when it is replaced.
 
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PC_GUARD

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Did you do the battery relearn thing? Modern cars track the battery age/performance and should be told when it is replaced.
Sat for 10 hrs undisturbed with fob on the otherside of the house.
 

ORRadtech

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Sat for 10 hrs undisturbed with fob on the otherside of the house.
Is that a proper procedure to reset the battery monitor? IDK. I do know that there are a lot of "internet" processes out there that may or may not actually reset the monitor.
I have a scan tool that will reset the battery monitor that I use so I know it's done.
 

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