Another vote for Odyssey. I've had one for about six or seven years and never had an issue with it. Keeps its charge when forgotten about over the winter, cranks the engine over faster than regular lead-acid and doesn't need any special chargers or warm up or anything. Ok, it's a bit more pricey than most of the rest - and on that basis alone I took some convincing to buy it - but it's been worth it.
Downside is they're only available in a number of physical sizes and on two of my bikes there isn't one that'll fit the battery box, but for the others it's the way to go.
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