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      12-21-2012, 03:53 PM   #20
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Drives: 2017 M3 ZCP / 2017 RRS SC
Join Date: Aug 2012
Location: Naperville

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2017 BMW M3 ZCP  [0.00]
Originally Posted by 1fastdoc View Post
I hear several people saying that using a battery tender makes a difference but I don't see how. I assume you mean driveability.

I have an '11 M3 with a little over 8k miles on it. I drive 1.6 miles to work. 2.9 miles to the gym and then 1 mile back home. This is 5 days/week plus a few miles on the weekends.

So far it still starts fine, the lights are bright, the stereo is loud, the heated seats keep my ass warm, etc.

With prior cars when the battery goes bad it won't start. What's different with the M3?
The life expectancy of the battery is better if you keep it charged to top levels instead of running it down to almost dead. It is a small price to pay(time/effort) to keep the battery performing longer before it has to be replaced.

17 M3 ZCP -- 2017 Range Rover Sport SC
12 X5 50i Sport -- 11 M3 DCT -- 2011 X5 50i(Lemon) -- 2008 550 Msport -- 2007 x5 4.8 sport -- 2004 545 sport -- 2002 x5 4.4 sport -- 2001 540i Msport 2000 SL500 -- 1997 SL500