C4 dead battery
05-05-2015, 03:53 PM
#1
C4 dead battery
something happened and the interior lights were left on in my C4 causing the bat to go dead, so no way do I want to jump causing possible ECM damage!! am wondering what would be a safe method to put a charge back in the bat, also what effect will a dead battery have on the ECM if any? thanx
05-05-2015, 04:02 PM
#2
Team Owner
Nothing at all wrong with jumpstarting to get the car to where the battery can be recharged. Do not simply start the car and then drive around to recharge the battery. 
The alternator is not designed to recharge a dead battery and it can be ruined doing that.
Check parts stores to see if they will rent chargers. AutoZone would be a good place to check.
The ECM won't be harmed by a dead battery or by recharging.
The alternator is not designed to recharge a dead battery and it can be ruined doing that.Check parts stores to see if they will rent chargers. AutoZone would be a good place to check.
The ECM won't be harmed by a dead battery or by recharging.
Last edited by c4cruiser; 05-05-2015 at 04:05 PM.
05-05-2015, 05:51 PM
#3
Melting Slicks
Remember some chargers will not charge a dead flat battery, they look for at least 10.5 volts. If that is the case put another 12 volt battery parralel and it will charge it.
Cheers
05-05-2015, 10:15 PM
#4
Melting Slicks
Member Since: Dec 2004
Location: Gurley (Keel Mtn, Sweet Home) Alabama
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Nothing at all wrong with jumpstarting to get the car to where the battery can be recharged. Do not simply start the car and then drive around to recharge the battery. The alternator is not designed to recharge a dead battery and it can be ruined doing that.
Check parts stores to see if they will rent chargers. AutoZone would be a good place to check.
The ECM won't be harmed by a dead battery or by recharging.
The alternator is not designed to recharge a dead battery and it can be ruined doing that.Check parts stores to see if they will rent chargers. AutoZone would be a good place to check.
The ECM won't be harmed by a dead battery or by recharging.
also, this is a great time for you to buy your own charger
05-06-2015, 05:51 AM
#5
Le Mans Master
Member Since: Oct 2004
Location: South-central Missouri
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GOOD POINT! I keep an "Oldie but Goodie" battery charger around, simply b/c it isn't as smart as the newer ones and will attempt to charge a rock, if you can find a way to connect to it!
05-11-2015, 10:17 PM
#6
Flatulent Dwarf
I have a couple of the old style "trickle" chargers around that I've had since I was a teenager ( No....they are not coal fired ) and they work pretty good for the test bench but Over the years I have switched out to the Battery Tender brand and keep one hooked to the motorcycles and the cars or trucks that are going to be out of service for any length of time.
The algorhythm they have developed has sure worked well for me in keeping these batteries ready to go and de-sulfated without cooking them like some of the cheaper knock-off versions have done to some friends cars.
They'll run you about 48-to 60 bucks and are worth it. I've bought the last two at Cycle-Gear for 49 when they have a weekend sale. They come with a SAE plug you can attach to your battery that makes hooking it up a breeze.
later, tiny
The algorhythm they have developed has sure worked well for me in keeping these batteries ready to go and de-sulfated without cooking them like some of the cheaper knock-off versions have done to some friends cars.
They'll run you about 48-to 60 bucks and are worth it. I've bought the last two at Cycle-Gear for 49 when they have a weekend sale. They come with a SAE plug you can attach to your battery that makes hooking it up a breeze.
later, tiny