Renault Forums :: Independent Renault forum - View Single Post - How does the Battery affect the MPG?

View Single Post
post #2 of (permalink) Old 12th November 2009
S.M.A.R.T.(y) Pants
VelSatisfied's Avatar
Join Date: Jul 2006
Posts: 16,938
Nominated 11 Times in 37 Posts
Nominated TOTW/F/M Award(s): 17
Thanks: 4,551
Thanked 2,471 Times in 1,852 Posts
Hi there.

I wouldn't have thought that the battery itself should impact on the general running or efficiency of the engine itself, as the engine should produce a surplus of charge to restore what has been taken away by the starting process, and whatever ancillaries are being operated.

The limp home mode, basically places an electronic ceiling over the amount of power the engine is capable of producing, just to prevent further damage - strange no warning lights or anything was found by the diagnostics though? Possibly a sensor picked up the battery's internal failing, and this triggered the ecu 's response?

5 years for a modern battery is pretty normal, and at this time of year, they do have a harder life - which usually sees off those which are borderline.

I'd keep an eye out for any re-occurence of the limp home scenario, but at least the battery should have a 3 year guarantee.



This job should never be complete - the day I think I've done it all, is the day I resign.

S.M.A.R.T. Technician
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater
VelSatisfied is offline  
For the best viewing experience please update your browser to Google Chrome