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How to maintain computer memory when changing batteries?

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
Hendoo
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How to maintain computer memory when changing batteries?

Post by Hendoo » Sun Mar 18, 2018 11:41 pm

My car is a 1999 S80 2.9.

I need to install a new battery in my S80. The owners manual says to turn off and remove key, wait 10 minutes, then change the battery. Battery is in the trunk, with easy access.

So I presume there are no radio codes to contend with. BUT -- I expect I will lose all the radio presets, homelink settings, etc if I do this.

I have a Battery Minder... can I just hook it up to the + terminal in the engine compartment and ground and change out the battery? This is a "smart charger". I also have an old dumbo 12V charger.

Or am I better off buying a "memory saver" that applies power through the OBDII port?

I don't mean to over-think this... but this car seems to be very sensitive to voltage levels so I don't want to cream anything.

Thanks!

-Hendoo
-Hendoo
1999 Volvo S80 2.9
1982 Volvo 245 Diesel

Waynefife
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Waynefife

Re: How to maintain computer memory when changing batteries?

Post by Waynefife » Sun Apr 01, 2018 9:45 am

Take a hand held 9 volt battery and some wire with clips and attach it at fuse box

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RickHaleParker
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Re: How to maintain computer memory when changing batteries?

Post by RickHaleParker » Sun Apr 01, 2018 1:41 pm

I have a Battery Minder... can I just hook it up to the + terminal in the engine compartment and ground and change out the battery? This is a "smart charger". I also have an old dumbo 12V charger.

Might work but those are unfiltered. The battery acts as a filter.
Another battery and some jumper cables would be a better idea.
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

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kranz
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Re: How to maintain computer memory when changing batteries?

Post by kranz » Sun Apr 01, 2018 2:49 pm

I've disconnected & reconnected the battery on my P2 & P80 and it has no effect on the Homelink.
Les is more.

jimmy57
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Re: How to maintain computer memory when changing batteries?

Post by jimmy57 » Sun Apr 01, 2018 8:32 pm

If the battery is not disconnected for more than a minute during the swap then there is almost no loss of anything. The capacitors in the modules will support memory retention for that long.

gstallons
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gstallons

Re: How to maintain computer memory when changing batteries?

Post by gstallons » Sun Dec 15, 2019 8:55 am

Get the Memory Saver and uce it . This will keep everything in memory while you exchange the batteries .

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