Home sick today so I haven't been out wrenching since tuesday. On the other hand, I've had a ton of time to research batteries and the like.
After googling for about 3 hours, I think this is what I'm going to get:
http://www.google.com/search?client=safari&rls=en&q=YT4B-BS+AGM&ie=UTF-8&oe=UTF-8It's basically a tiny dirt bike battery. Some guys on a triumph forum say it works great for their older kick-only 650's. This particular model is great because it's only 1.5 inches thick so i can tuck it up under the seat, and the best part, you can find it for $20 including shipping. Added to that, it's an AGM battery so I can use my battery tender that I already have, and don't need to invest in a high tech charging system.
It's only 2.5 AH but heck, it's twenty bucks.
The only way I've found to get more amp hours out of a battery and still maintain the small size is to go Lithium. The downside of that is they're massively more expensive, temperamental with charging systems, and really suck at cold weather starting.
Here's another Lithium option if people are considering the AntiGravity linked above:
http://www.ballisticparts.com/products/batteries/4cell.phpIt's smaller in general, but not as thin in one dimension. Still almost $100 bucks, but still only provides 2.5AH. If I went lithium I think I'd go with the 4 cell AntiGravity in my initial post, which boasts 6AH for $120.
I'm going to order this tiny dirt bike battery, and it will probably work. I'm going to be Kickstart-only for a while still, and if I ever decide to fix the E/S we'll see how long it works for. Not too worried about adding the LED's either. If it craps out in a few months, who cares? it's twenty dollars.
Chuck