I'd like to know the same thing actually.
When I'm using WiFi and get down to 25% my Axim decides it's time to shut WiFi off of it's own volition. A messege pops up and says something like
"Battery Low. Will Diable WiFi in 30 second. Yes/No".
I've been choosing to not let it disable WiFi when that window pops up and I'm able to continue to use Wifi, but the flashing light is going off constanly and, quite frankly, it's annoying.