I've had 2--for our 06 and 99 Boxsters; I highly recommend them. Our 99 had the OE battery when we sold it and I think part of the longevity is due to the tender we kept it on. I got it from wally world for $25.
The 06 has the porsche tender with the cigarette light adapter; it works equally well but is more expensive--about $60.
BTW, you'd be suprised how much starting the car in cold weather and short drives can drain the battery; I did that a few times last month and the trickle charger was charging for nearly a day.
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2013 Boxster S
2006 Boxster--sold
1999 Boxster--sold
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