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Old 18-12-2016   #1
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taking battery out of car

What happens with board computer when taking battery out of the car for charging?
Manual says all data will be lost. In fact, if i understand it correctly, it says trip data A and B will be lost.
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Last edited by user unknown; 18-12-2016 at 12:00.
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Old 18-12-2016   #2
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Re: taking battery out of car

Trip data will reset to zero, clock will need resetting. If the engine computer has a learning facility, to adapt to your driving style, that will also return to base settings.
None of this is important.

The important issue is why you think you need to charge the battery. Are you not using the car enough, or is the battery failing? Or did you just leave stuff switched on and flatten it?
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Old 18-12-2016   #3
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Re: taking battery out of car

Thanks!

My car is 2,5 year old and i heared that for many people battery gone dead after 2-3 years, so i have just checked mine, and it says 12.12V. So...
But with 12.12V maybe it is alreday too late for charging, it will have to be chagned soon anyway.
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Last edited by user unknown; 18-12-2016 at 12:34.
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Old 18-12-2016   #4
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Re: taking battery out of car

Hi if your car engine is turning over and starting briskly even though it has sat in sub-zero temperatures overnight your battery should be good for some time.
Sometimes a battery cell can fail without any warning but the main reason for trouble is that a battery losses it's grunt over time and then cannot cope with extreme cold Here in the UK we can have a mild winter and then a really hard frost that catches many people out who end very late for work! And breakdown recovery busy. If you do change your battery make sure it has the biggest amp hour rating that fits so you have plenty in reserve.
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Old 18-12-2016   #5
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Re: taking battery out of car

Quote Originally Posted by user unknown View Post
Thanks!

My car is 2,5 year old and i heared that for many people battery gone dead after 2-3 years, so i have just checked mine, and it says 12.12V. So...
But with 12.12V maybe it is alreday too late for charging, it will have to be chagned soon anyway.
12.12v is a bit low. This could indicate a discharged battery, but why? If the car is in normal daily use, the battery should read 12.4v minimum, better would be 12.5-12.7v. Is teh alternator charging correctly?

If it is a stop/start car, 2.5 years may be its life. For a normal car, 5-7 years is better, but only if the battery was fresh when first used.

To help more, we need to know its use before this, to help determine why it is low.
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Old 29-01-2017   #6
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Re: taking battery out of car

Quote Originally Posted by portland_bill View Post
12.12v is a bit low. This could indicate a discharged battery, but why? If the car is in normal daily use, the battery should read 12.4v minimum, better would be 12.5-12.7v. Is teh alternator charging correctly?

If it is a stop/start car, 2.5 years may be its life. For a normal car, 5-7 years is better, but only if the battery was fresh when first used.

To help more, we need to know its use before this, to help determine why it is low.

I have been a battery technician for over 40 years and the correct voltage for a fully charged 12 volt lead acid battery is 13.2 if it drops below 11.9 you will have a problem charging it. The lives quoted above are not absolute and with propper care there is no limit to the life and my boss got very iritated if a battery did not last 30 years. With the engine running and charging the battery the voltage should be between 14.9 and 15.4.
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Old 29-01-2017   #7
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Re: taking battery out of car

You can use a pair of crocodile clips in order to connect another battery during the taking battery out of car.
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Last edited by autochan; 29-01-2017 at 19:48.
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