2 amp will work better.

what sort of time would you charge the battery for?

Personally, I would buy either an automatic charger or one of the varieties of a Battery Tender (or other brand name). I would make sure it had a low rate of charge. Many automotive chargers have several charge rates, including usually a 2 amp range. That way you don't have to worry about how long you leave it connected, because it won't overcharge the battery. Connect it, check it later or the next day, and if its indicator says the battery is charged disconnect it.

By the way, a trickle charger is nothing else than a regular charger, except it has an output of usually less than half an amp. A trickle charger will, just like a regular charger, "boil" the electrolyte out of the battery if left connected for long times. I ruined a 105 amp-hour Group 27 trolling motor battery by leaving a trickle charger on it over the winter.

Full battery is @ 14.5 or close to it.

   A little over 3 months ago I covered my motorcycle up in my garage,My garage never gets below 32 degrees and is dry,I took off the cover and put it on prime for one minute,It started up right a way ran it for 10 minutes.Its a 2006 and the original battery. I guess I don't need a battery tender every one is so hung up about.

Bill is correct. If your battery is in decent shape, and was reasonably well charged, you do not need a battery tender or charger. The battery will hold an adequate charge for at least three or four months, given that there is no other drain on it such as a clock or a radio with station memories. If it doesn't, it is already on its last legs and will likely fail before too much longer. But there are a lot of motorcycle owners who "humanize" their machines and believe that lavishing extra care on them will make them run better and last longer. A battery tender falls in the category of doing no harm if properly used, even if it isn't really needed. Same with using premium gas instead of regular (unless the manual calls for premium), high-dollar special oils, fuel and oil additives, and so on.

I would think a 1-amp charger would bring a small battery (your motorcycle battery) up to something over 14 volts, but it might take overnight to do it. Before I panicked, I might try the charger on another battery, such as a lawn mower or a different motorcycle. I might also check the current output of the charger, just to make sure it is doing what it is supposed to do. If your battery has either semi-transparent sides or removable caps, I might check to see if the electrolyte is bubbling more or less equally in all cells.

I bought a Battery Tender Jr. a couple of weeks ago (.75 amp, I think?).  I was worried because we haven't been able to ride.  My husband and I both got new batteries this summer, and I didn't want to risk losing them, since they were more expensive than the Tender.  But when I hooked up my S40, it took less than half an hour to fully charge.  My husband's C90 took a while longer, but it has alot more electronics than my bike.  My point is, I agree with Charon.  I think I could have made it all winter without the Tender, but I'm more at peace knowing it.  I'm glad we bought it anyway, since the C90 seems to enjoy it...