Depends on how long/how fast. Creeping in traffic with the lights on, the alternator will not keep up with demand.

90% of my trips recently have been between 1-3 miles at 4am, so heaters on, front and rear heated screens, heated seats, lights stereo etc, so I vouch for data's opinion, I had new battery on a year ago, got best I could and I managed to drain it with short journeys

Thanks again Data for your help
 
90% of my trips recently have been between 1-3 miles at 4am, so heaters on, front and rear heated screens, heated seats, lights stereo etc, so I vouch for data's opinion, I had new battery on a year ago, got best I could and I managed to drain it with short journeys

Thanks again Data for your help

Use the aircon to demist the front screen instead of the electrical heater and wear thicker underpants instead of using the heated seats, that will reduce the alternator load a fair bit ;)
 

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