dr_Henio wrote:what is the voltage on each (red, yellow) pins internal battery?
At full Charge:
-Blk +red = 8.40Volts
-Blk +yel = 0volts
-yel +red = 8.29Volts
There is not voltage rating on my internal, but the external says 7.4Volts. After just powering on the the unit a couple times and a few minutes usage, the voltage dropped to 8.05Volts. I suspect there is a surface charge in play.
Resitance reading blk-yel = 116.4K ohms @ 67deg F (this is probably a temp sensor )
Guessing the Blk to yellow connection is a thermistor, I place the Battery in the Freezer for a few minutes.
Check Resistance again.... Started at 420K ohms and watched it decrease resistance over time.... Funny it was about 1K ohm per second...
Since the thermistor is most likely for charge/overcharge protection you can get away without the connection for yellow since you have no battery to protect.
I did confirm the unit will boot with no connection at the center/yellow pin.
Also worth noting is the picky behavior of the DT and battery status. If I remove the internal battery from any of my DT's 366GX and 366LX, the unit won't power on until I plug in the power chord. This is true even if the external battery remains installed. I don't need to power on the unit with the cord attached. All I have to do is plug in the DC jack for a second or two. I can then remove the cord and power on just with the battery.
Hope this helps.