2001 Mitsubishi Diamante Battery getting drained if car not

2001 MITSUBISHI DIAMANTE
50,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MURTYVADREVU
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I bought a used Diamante 2001 and it came with 26-5S battery and battery is getting completely discharged if not used for two weeks.
Now Walmart recommended that this car must use 86-S battery.
Is there any problem with electrical circuit or alternator or size of the battery
Jun 1, 2010 at 4:26 PM
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RASMATAZ
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Sounds like a short eating up the battery or something is still on that's drawing current -battery drain test below.


https://www.2carpros.com/forum/automotive_pictures/12900_parastic_draw_1_215.jpg

Jun 1, 2010 at 4:32 PM