Pine64 Head Unit

[tllim]

So I've had the pine64 with lcd touch screen + wifi/bt on the shelf since the autumn, but been a bit busy so haven't really had the time to look into it until now. Unboxed it yesterday and tried some different android builds. The 6.0 and 7.0 android build just didn't work so well, 7.0 was really sluggish and both of them often refused to boot for some reason. So eventually I went for pine64's lollipop build and it seem to work fine.

I manage to connect an external USB GPS module (http://www.globalsat.com.tw/en/2-909-307...99954.html) and it seems to work together with "You Are Here GPS" app running in the background. There is an article about it (http://mapsnmaps.blogspot.fi/2014/02/usi...droid.html). I haven't moved around with the pine64 yet so I can't tell how accurate it is yet (need to get the battery to work first)

And about the battery, I stripped my old nexus 7 of its battery and connected it with the pine64 with a 3-pin JST connector (http://www.ebay.co.uk/itm/JST-2-0mm-PH-3...281cdfaf94). The cables on the connector did not quite match the pine64 as the black cable comes down on positive and red on negative, but it was just to connect them opposite on the battery. I did not connect the temp cable as I didn't know it was compatible with the nexus7 battery. But it doesn't quite work it seems... The pine64 recognize there is a battery connected, but it doesn't seem to charge, I left it on over the night, but the battery is still at 3%. I manage to boot the device without external power, but it died after 5min or so, and still doesn't seem to take any large amount of charge. I wonder if little board on the nexus battery is preventing it somehow since I the other two connectors are just hanging as dummies now. I have to dig deeper in it.
EDIT: From this thread (http://forum.pine64.org/showthread.php?tid=2938) they indicate that you most use the temp wire in order to make it charge, so I wonder if the nexus temp wire (yellow?) would be compatible, is there a risk just trying it out or can this be researched anything?

I also tried to connect a Behringer DAC to the Pine64, but it seems this build doesn't support external DAC to replace the sound handling. Which is a bit sad since lollipop is suppose to support USB DAC. I never got to try it on android 6.0 or 7.0 yet.

Thats what I have to report so far...

Please place a pull down 10K resistor or thermistor on the Vbat middle pin, this allows Pine A64 start charging the Lithium battery. The middle pin is the sensor to prevent Lithium overhear.
No idea of the two middle pins usage for teh Nexus 7 battery

What type of resistor would you recommend, and what effect should it house? Does it matter? Do I just bridge this to the ground/negative cable on the battery?

Just normal 1/8w or 1/4w 5% 10K ohm resistor that commonly available, connect to the connector ground signal, NOT battery negative terminal.