*** Update *** Bought new battery - tried to start N900 and didn't get past the screen with Nokia in blue on white background. Thinking the new battery might not be fully charged I left it charging all night, this time back in my home country ith a wall charger - and now the second battery is empty also!

I now assume I will have to reflash - but before getting a third battery or an external charger - I want to make sure it will work. When I connect the phone to the computer via usb I cannot see the n900 as a flash drive. Does this mean I won't be able to flash?
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Hi,
I am in the middle of a trip in the USA (not my own country), and my phone suddenly died - I'm pretty sure it is the battery (not charging, begins with yellow constant light, then flickers, then this starts over and over).
The big problem is, I use the phone as a GPS - and now I don't know my way around....
Where would be the place to look for a battery (in a real store - not amazon or ebay where I would have to wait a few days), what retail store carries them? I am in Daytona Beach Florida.