DT400 battery voltage

Here's a handy little trick: On the Digitrax DT400-series throttle, you can insert a battery while looking at the screen. The screen will display the battery voltage as it powers on. The throttle must not be plugged in while doing this check.

9V non-rechargeable (Alkaline, heavy duty) batteries should be replaced when the voltage shown is under 8V.

I believe it works on the DT300-series throttles as well.