Thank you, guys.

I left the GPS on a wall-to-USB charger for almost a DAY. Nothing.

Also left on a computer USB for several hours. Nothing.

Disassembled again and checked the batteries: the old ZERO volts ; the new one 3.7 Volts.

This is the new one got from EBAY seller. It says 3.7 V lithium-polymer 1200mAh / 4.4 Wh. This is the one that brought the GPS back to life, for about 5 minutes.

My take, at this time, is that the internal electrical connection inside the GPS, between the battery and the main board, somehow broke ! The charge never gets to the device itself; never passes the battery.

I 'm looking for a service place in Brasil.

Any comments ?