Yaesu FT-897 FNB-74 Pinout and SOLAR

[kw7dsp]

I would like to charge my FNB-78 and W4RT OPP897 batteries with my SOLAR panel. What are the purpose and pinouts of the charger connection? Any other information?

Also: Not one single bit of information from Yaesu, or any website I have found, on useing the external batery while the internal batteries are installed. Looking over the schematic it would seem the internals are switched (Relay) out when the power is applied externally.

[kw7dsp]

Here is what I found from several sources

Pin 1 Black Battery Negative also Black wire to radio 3 pin plug.
Pin 2 Yellow Connected to pin 4 (Charger reads pins 2 & 4)
Pin 3 Red Battery Positive also Red wire to radio 3 pin plug.
Pin 4 Yellow Connected to pin 2 (Lets charger know it is connected)
Pin 5 Blue Straight through to Blue wire Charge LED on radio 3 pin plug.
Pin 6 White To thermister 10k Ohms 20 degrees Celsius (Overheat Sensor)

Note: Pin 5 is 5 volts to LED in radio (Maybe even less)
Battery needs 16 volt for full charge
CD-24 boosts 12 volts or drops 24 volts to 16 VDC

Battery will charge with 16 VDC on pins 1 neg and 3 pos