I've been buying Deka batteries for awhile now and they have been great to me as a customer.
I had an OEM VW battery made by Varta. It lasted from October 2005 to May 2014. It spent time in Michigan, Minnesota and northern Germany. I never had any problems with it.
The OEM battery is probably the best bang for the buck. I replaced mine with another OEM one after 7 years as a preventive measure. It was still performing fine.
Agree with everybody on here, change your battery - I had similar problems and others not mentioned, changed the battery and almost all problems disappeared.
I just ordered a Deka EXT20L, from what ive read everyone loves it. At $87 from Lowes its worth the gamble. Its a sealed AGM battery so it can be mounted anywhere, ill be putting it under the rear seat.
I bought my 2008 3.6 4motion wagon a little over 3 years ago. It came with the original OEM battery, part number 4F0 915 105 E, and I was both impressed that it lasted that long and curious as to how much longer it would last.
I have personal experience with with both battery technology and the litium ones put the conventional small battery to shame. If I left my car with the small Deka that's in it for a few weeks without starting, or turning off the cut-off switch, the alarm and small draw I have from a wacky door switch would completely drain it.
My current dead battery is a Deka - lasted 3.5 yrs, can't complain.
I only use Varta batteries and i hade my 4 years and i dont even use it in winters(6Months) and when i charge it it keeps me up the rest of the summer around 6 months there too...=)
Service guy just stopped over and confirmed the battery was bad. Replacement installation in progress.
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