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The car behind my question is a 1999 S80 2.4 but I believe the root problem affects all P2 platform Volvos.<p>The backup batteries in the anti-theft alarm have a finite life. When the end of their life is approached they fail to take a charge with the consequence that the main car battery becomes flat due to a continuous attempt to recharge the alarm battery when the car is parked up for an extended period.<p>The problem is that the alarm sounder is a sealed unit that also includes the battery. Volvo "repair" is to replace the entire unit at £££s ( or $$$s no doubt too <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"> )<p>Is there a known hack to take the unit apart and replace with an equivalent consumer battery, please? I don't want to buy a second hand unit and then have that fail too.<p><br>TVM.<br>
 

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Re: Replacing alarm siren backup battery (Borehamovi)

Google found my answer, shared here for anyone else contemplating the same fix. Thanks due to vegasjetskier for documenting it so clearly.<p><A HREF="http://www.matthewsvolvosite.com/forums/viewtopic.php?f=11&t=17479" TARGET="_blank">http://www.matthewsvolvosite.c...17479</A><p>
 

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I was going to try to find that for you <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"> My car has the same problem...<p>For others stopping by: (from what I remember) the consensus seems to be that the battery leaks and destroys and whole circuit board, so you need to buy a whole new unit, but it apparently doesn't need to be initiated by the dealer <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 
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