Change battery before it goes bad

Tiny
BILL MILLER2
  • MEMBER
  • 2009 VOLKSWAGEN BEETLE
  • 2.5L
  • 5 CYL
  • FWD
  • AUTOMATIC
  • 40,000 MILES
My battery is original making it eight years old. I know it will soon go bad, but I want to replace it before that happens. I have heard that if you disconnect the battery you may have problems with the car after replacing it. I have worked on cars for sixty years have replaced many batteries and this is the first time I ever heard that the battery has to be replaced by the dealer. What should I do?
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Wednesday, July 12th, 2017 AT 5:49 PM

5 Replies

Tiny
CJ MEDEVAC
  • EXPERT
Many auto parts stores use a "battery saver" device that plugs into your cigarette lighter prior to the old battery being disconnected.

This sort of keeps critical computer components alive during that time.

For instance, one common problem that could occur without the saver is the "idle loses its memory". The idle might go up and down for a while until it "relearns it's idle". This might take some driving to get it right again, the battery saver might eliminate this headache and others, like "anti-theft" preventing it from starting (that would make your day!).

Call around to see if their store uses one.

Also lets (you) insure it is in place before the battery gets touched! People do get careless!

This might aid you also, see my link!

http://www.2carpros.com/questions/2001-dodge-neon-milage-just-want-put-fliuds-their-locations

Return with good results, let us know how it went!

The Medic
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Wednesday, July 12th, 2017 AT 8:05 PM
Tiny
STEVE W.
  • EXPERT
An easy trick to do a replacement on a vehicle like this is to connect up the battery in a different vehicle (or any twelve volt battery really, jump pack, lawn tractor, motorcycle, mother in laws O2 pump) to the battery connections that the cables run to. Like a jump terminal, rear of the alternator, battery stud on the fuse box. Then you can remove and replace the main battery and the vehicles modules never see that you disconnected it at all. This can be a real saver on many newer vehicles, as disconnecting can wipe out a lot of presets and memory items.
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Wednesday, July 12th, 2017 AT 9:11 PM
Tiny
BILL MILLER2
  • MEMBER
Ok so today I replaced my battery 2009 VW Beetle 2.5L automatic. Before disconnected the battery I connected a 12.5 volt 3 amp power supply to the positive battery cable and taped it so it would not disconnect from the cable and not short to ground. I connected the negative lead of the power supply to ground. Then I disconnected the negative battery cable taped it then disconnected the positive cable from the battery and taped it so it would not short to ground, the power supply powering the computer and other accessories. Removed the pipe from MAF to air filter and disconnected sensors to the pipe removed the air filter and air filter box. Removed battery hold down bolt removed battery. Then reversed the procedure to install the new battery. Started the car everything worked fine no problems.
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Saturday, July 15th, 2017 AT 4:14 PM
Tiny
BILL MILLER2
  • MEMBER
Thank you C J MEDEVAC and STEVE W.
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Saturday, July 15th, 2017 AT 4:16 PM
Tiny
CJ MEDEVAC
  • EXPERT
Glad you gotter done!

Next time you need us, somebody will be here!

Thanks for coming to 2carpros!

The Medic
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Saturday, July 15th, 2017 AT 6:24 PM

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