No electrics xpert here, but it should really only be a result of
a few things:
-bad batt. to start with, (an '06 batt. should not
be dying yet).
-bad alternator resulting in no charge to batt.
-a drain somewhere in the system...
A few days or even a couple weeks should not leave you with
a dead batt on a less than 2 yr old battery, imo.
Stlr could/should run some tests that show how the real
condition of your battery: remove surface charge, state of
charge test and a load test...my guess is the "techs" did
none of this; they simply slapped on a high amp charger
and said you were fine.
Batts, that have failed or are failing, are very hard to diagnose
as to "why", imo. I'd lean on them for a new one or, a highly
discounted replacement if they are gonna stick you with a
R&R charge...then, if your X croaks again with a new batt.,
you have at least eliminated one facet of the wonderment.
GL,mD
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