The batteries are in series and the glow plug harness is in parallel. The 1.65 voltes is an actual measurement of voltage in the system when the battery voltage is at 2.84 volts (full charge). The straight voltage off a power panel with the dial all the way down is 10.56 volts.
When I started the 182 with a remote set up I had to set the dial to 4 or better. One nicad in my onboard set up would not start the engine, so I upped the voltage.

Jim