My GW-5000 went to low battery staus from lack of light (winter in Canada, wearing under cothes, etc). That's what I assume happened, I can't get it back to high battery, after alot of exposure to sun and lights. Also it stopped synching. Any advice? How much light does it take to get to high battery status again, and does it need to be on high battery to synch? Any advice, tips would be greatly appreciated.