I had the same issue as you - fine when on the move on flat ground, potentially for many miles, stop start traffic and hills the power would drop then the EPC light would come on and raise error 14846. Phoned audi for a turbo price just out of curiosity - £4407 :puke2:
14846 error unrelated to the battery and was caused by worn linkages on the turbo- so a new turbo... I pick the car up later and will be £1700 lighter.
If the car so much as looks at me funny after this its getting part exchanged for a Kia.
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