However, the pinout of the connector is extended to signal the connection of the external DC battery charger. THe Universal recognizes the charge power supply because pin 4 the mini-usb connector is pulled to ground (pin 5). The fast charge mode is apperntly switched directly from pin 4.
Many 3rd party chargers are lacking this connection of pin 4 to ground, which is why they often do not work reliably.
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+!!! Something additional for the BLUEANGEL !!!
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+To built a USB-Cable to sync and charge the BA via USB form the PC, you have to connect following Pins:
+You MUST NOT connect PC-VDD to BA-Pin 20, 21 or 22 or PC-GND to BA-Pin 2 (GND-Sense) cause then, the cable would allow syncing, but won't charge the BA form PC-USB!
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+(...although a cable like this would charge the BA with an ACtoUSB-Adaptor. The reason seems to be the higher voltage (PC-USB: 5V <=> Adaptor: 5,5V or above)