Here's a post from me last winter - and I've had no problems with this battery since:
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I found a battery called DEKA ETX20L. Here's a link to a place down the road from me where I got mine for $83 and you can read the basic specs (search online for more details):
http://www.batteryservice.com/products_ ... ber=ETX20L
I rode the bike yesterday in 2° F (feels like -15) and it cranked fine - turned over solidly 3 times and fired up. It's kept in an unheated garage and hadn't been started for 3 weeks (temps have been well below 0 F). I keep it on a 1.25amp battery tender. The advantage, as I see it, over the Odyssey is: I can use my Battery Tender Plus (I'd need to purchase a new charger for the Odyssey) and it's the exact dimensions of the OEM battery, so the toolkit still fits for those that use it. Also, I'm guessing it's lighter than the PC625, but can't confirm that - certainly smaller
Lastly, I asked Gary (G-Man) to check over the specs, and although he would definitely recommend the PC625, he thought this could be a viable alternative. So far, for me, so good
Deka batteries are made in PA
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Hope this helps,