Join Date: Jun 2017
Location: Near Geelong Victoria Australia
Drives : Only i40 these days ..
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As an Australian, we have (like you should have) a warranty on the vehicle that includes several other items like the full charging system .
My i40 should not have a worn / faulty battery unless I have left lights or other extras left on. If the battery went flat, and it would not charge, there is a lifespan / warranty on the battery of (usually) 2 + years, and you should be covered there, plus the Dealer should not be making you pay for checking any faults.
You can ask any friend if they have a Battery Charger that you can use, but be sure to remove the battery if you charge it overnight.
I checked mine, and the battery can be removed in a few minutes. If it will not stay charged, I would work on First a faulty battery, and next A fault in the charging system that should be fixed by your dealer for free (as the vehicle is only 18months old).
Just my opinion ...