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This year's battery is 12V at 18Ah, the charger is somwhere about 14V at 1A.
Last year's battery is 12V at 17.5Ah, the charger is some voltage I don't know off the top of my head, at 4A.
So... assuming the charging is 100% efficent (HAH!):
18A at 1A/hour = 18 hours
17.5A at 4A/hour = 4.375 hours
Remember though, these values are for a *totally* dead battery (and they are a little small, I can gaurentee that it won't charge at 100% efficency)!
I'd reccomend charging your batteries up all of the way, and putting some kind of ammeter on your robot and charger. This way you can have a pretty good idea of the charge state of the battery.
Why did FIRST give us this *WIMPY* charger this year? Why do they care what we use to put energy back into the battery? This, I think, is most uncool.
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