[avalonandl]

Originally Posted by Teneck83

On my second battery with no solution. Even 30 minutes off of the battery tender, it won’t start.

Does anyone have a clear cut solution. I’m hesitant to bring the car to a dealer only to receive some bs answer

Battery tenders only put out about 0.25 amps.....thats not enough to charge in 30 min....
"
EDIT: I switched to a Battery Minder 1510- it has a "de-sulfarating mode allows batterys to recover...

[17rsvert]

Originally Posted by Teneck83

On my second battery with no solution. Even 30 minutes off of the battery tender, it won’t start.

Does anyone have a clear cut solution. I’m hesitant to bring the car to a dealer only to receive some bs answer

Have you made any electrical modifications to the car? Even minor changes like switching from OEM to LED light bulbs might cause the Body Control Module to stay awake and that can cause a problem.

[17rsvert]

Originally Posted by avalonandl

Battery tenders only put out about 0.25 amps.....thats not enough to charge in 30 min....
"
EDIT: I switched to a Battery Minder 1510- it has a "de-sulfarating mode allows batterys to recover...

Good point. A fully discharged battery may take a full day or so from a full strength battery charger (as apposed to a battery tender) to bring it back to 100% charge.

Not sure if Teneck83 meant to be saying it was 30 minutes after he removed the battery tender, or after a 30 minutes charge on the tender.

[Teneck83]

30 minutes off the tender. I always leave the car on the tender while parked in the garage

[Teneck83]

Originally Posted by 17rsvert

Have you made any electrical modifications to the car? Even minor changes like switching from OEM to LED light bulbs might cause the Body Control Module to stay awake and that can cause a problem.

It’s bone stock.

[Danew_377]

I've had issues like that lately. Only thing I can say is the taillights I purchased for the car caused it to go dead after sitting for a period of time. It did cause a subtle drain over time and if I don't drive the car for a week or so it will die. I drove across country with the car and back with no issue but seven days and no driving causes a dead battery.

I'm looking into how to prevent this from happening and keep my lights at the same time.

[17rsvert]

Originally Posted by Teneck83

It’s bone stock.

You mention using a battery tender. Have you tried a long charge from a full size charger instead? A tender will maintain a charged or slightly discharged battery, but will take forever to fully charge a depleted battery.

[17rsvert]

Originally Posted by Danew_377

I've had issues like that lately. Only thing I can say is the taillights I purchased for the car caused it to go dead after sitting for a period of time. It did cause a subtle drain over time and if I don't drive the car for a week or so it will die. I drove across country with the car and back with no issue but seven days and no driving causes a dead battery.

I'm looking into how to prevent this from happening and keep my lights at the same time.

I had the same issue changing the reverse lights to LEDs. Put the originals back in and no problems since.

[arpad_m]

Originally Posted by 17rsvert

I had the same issue changing the reverse lights to LEDs. Put the originals back in and no problems since.

That's a fair point, but the originals suck big time... I use the Gen5DIY reverse light harness and the car has no such problems, starts right up even after several weeks, battery voltage is fine and charging works as expected.

[H(.)(.)ters]

Originally Posted by Danew_377

I've had issues like that lately. Only thing I can say is the taillights I purchased for the car caused it to go dead after sitting for a period of time. It did cause a subtle drain over time and if I don't drive the car for a week or so it will die. I drove across country with the car and back with no issue but seven days and no driving causes a dead battery.

I'm looking into how to prevent this from happening and keep my lights at the same time.

The Helix tail light vendor (Roy at Camaros and Coffee NorCal) sent me a harness to reduce the draw from the lights which had been too high and preventing the BCM from going into sleep mode.

[Teneck83]

Originally Posted by 17rsvert

You mention using a battery tender. Have you tried a long charge from a full size charger instead? A tender will maintain a charged or slightly discharged battery, but will take forever to fully charge a depleted battery.

I’m on my second battery. An optima yellow top. Second day new battery was in the car, same as before. Brand new, fully charged battery.

[17rsvert]

Originally Posted by Teneck83

I’m on my second battery. An optima yellow top. Second day new battery was in the car, same as before. Brand new, fully charged battery.

So I guess that means you did not try a full size battery charger.

Did you verify the new battery was fully charged yourself, or assume it's fully charged because it's new?

Did you check the battery voltage (with the motor off) after the battery has been disconnected from the tender for several hours?

Regardless, a battery tender alone is not going to fully charge it unless you wait a really long time.

Sometimes we make assumptions that make troubleshooting harder.

[avalonandl]

Originally Posted by 17rsvert

Good point. A fully discharged battery may take a full day or so from a full strength battery charger (as apposed to a battery tender) to bring it back to 100% charge.

Not sure if Teneck83 meant to be saying it was 30 minutes after he removed the battery tender, or after a 30 minutes charge on the tender.

The Battery Minder 1510 brought my OE battery from 60 % life back to 90%.

[17rsvert]

Originally Posted by avalonandl

The Battery Minder 1510 brought my OE battery from 60 % life back to 90%.

Not sure what you mean by "life". To me, battery life means how many charge/discharge cycles left in the battery compared to new, or what percentage the battery has time wise before it needs replacement. For example, if you expect a battery to last 4 years, after 3 years it has 25% life left. By that definition, a charger cannot raise a battery's life.

If you mean level of charge, 60% is no where near a fully depleted battery.

A fully charged, rested battery will read about 12.6 to 12.7 volts.
90% charge is about 12.5 volts.
60% charge is about 12.1 to 12.2 volts, still enough to start the car.

A fully depleted battery, 0% charge, will read less than 10 volts, and might crank the car weakly, if at all.

How are you arriving at the 60 and 90% values?