I hope that I understand the situation correctly:1) MAVlink protocol has a message type that includes a slot for reporting mAh remaining in battery.2) HK-GCS does not utilize the mAh information, so the very nice widget for reporting battery status only responds to battery voltage and battery capacity does not change with time.3) HK-GCS has a place (and widget) for showing battery amps, but MAVlink does not have a message type with a slot for that data, so HK_GCS has to show battery current as constantly zero. This is not the fault of HHK-GCS; it's not being supplied with relevant data. Hopefully a future MAVlink protocol update will at least provide battery current data in a message so that it can be displayed by ground stations.I found these things out (courtesy in large part to Doug Weibel) when I added a current sensor to APM 2.12 and found that no ground station is able to report battery capacity remaining or battery current. Only APM terminal shows battery current and capacity.At the moment, I'm thinking of adding a work-around by modifying the APM 2.12 code so that I can select (via an RC channel value) whether the battery_voltage variable is filled with actual battery voltage or battery current or mAh before it is sent to HK-GCS. A kludgy way to multiplex that data, but it will probably suit my usage well enough.