Kind of confused by your description. Is it frozen or are the cells dry?
If frozen be careful when it thaws, the case can be cracked and leak the electrolyte. Never charge a frozen battery.
If the cells are just dry, top them off with distilled water and charge it.
Most likely that battery is shot. I have never seen one have a useful life after freezing.
Get the ytx20hl-bs. I'm still using mine from my 04 800x. Take it out on the last ride of the year and put it on a tender before you put it in the sled for the first ride of the year. They will last a really long time.
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