My MY2007 S2000 also came with Panasonic battery. I replaced it with Walmart battery in last summer (2015), So it ran for 8 years.
Original factory Panasonic battery in my RX-8 lasted 7 years. The 'premium' Exide I replaced it with is on it's way out now after only 4 years.
When I bought my 2006 4Runner V8 three weeks ago, it had the original Panasonic battery on it's last leg and I had it replaced with a Toyota True Start battery. The 4Runner only had 109,600 miles when we had that battery replaced.
AGM power supply/comfort battery replaced. Overall it went without a hitch. I had the choice of an Exide or a Varta AGM from Tayna Baatteries. The Exide with a price discount was about \u00a310 cheaper than the Varta, so I chose that one at \u00a3133 delivered.
Next battery I am going to put in my Passat is going to be something made by Exide . I mentioned before that I changed my OE battery in the winter 2007-2008, was concerned with low temperatures of this winter, but battery seems to do very well, started at 9*F and still work without a problem.
I just got a new 47-36 battery made by Exide. The vent tube routes as Dr. Bob describes, and the clamps fit perfectly. My only issue with the new battery is that the vent caps are way at the back and may be hard to reach.
You were right in saying the battery was weak. More or less the battery was beat like a baby seal, so I replaced it with a preimum Exide unit
I tried my spare key, and the first time I used it, I got a weak battery warning. I never had that warning on the key I regularly use. I replaced both batteries, and still had the problem.
However, I have had nothing but bad experiences with Exide batteries. I've bought three, and all have died within 2 years.
My Tiguan factory battery was an Exide and it failed after 2 years, mostly in the Northeast US weather.
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