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GTS 4.0 battery

Holy thread resurrection Batman.

Just picked my car up from the dealer where it's had a replacement battery fitted. Pretty much same symptoms as everyone else here, kept on a proper hard wired AGM maintainer but only lasts 3 days max before it wouldn't start the car. Dealer has been very thorough and done full battery drain diagnostics and it's drawing next to nothing when sat (fractions of a ma). They tested the battery when I dropped the car off and it passed diagnostics. They then left the car for 3 days as I'd described and repeated the battery test - failed. Either the battery life is about 3 years or so or the maintainer is causing issues. I've had similar issues on an additional 2 non-Porsche cars where they weren't on a maintainer as they were in regular use. One of them is definitely an AGM battery but can't remember what he other one was but it was definitely not conventional wet cell. Same result, not enough current to crank.
 
I personally don't think battery maintainers are any good.

My car is 6.5 years old, lives outside and is driven all year round with a maximum of 4-6 weeks between uses. It's used more regularly in the summer as you might expect.

No battery issues as yet. In winter, if I've left it a bit too long it can be a bit sluggish to start, but the battery has yet to fail to crank the car.

*touches wood for luck*
 
ralphmusic said:
I asked because if the earth fixing is not really tight you can get battery drain even with the conditioner apparently working and end up with a flat battery as I found out once...
Click to expand...
It's definitely working as the battery was never flat initially - just went flat very quickly after it had been disconnected from the conditioner and left to sit for a few days. I also checked the resistances of the conditioner connections and they are fine.
 
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