# Qgroundcontrol - Battery Indictor
**URL:** https://discuss.bluerobotics.com/t/qgroundcontrol-battery-indictor/16558
**Category:** Batteries and Chargers
**Created:** [April 7, 2024, 7:56pm UTC](https://discuss.bluerobotics.com/t/qgroundcontrol-battery-indictor/16558 "2024-04-07T19:56:32Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Lcolville77](https://discuss.bluerobotics.com/u/Lcolville77)
#### Post date: [April 7, 2024, 7:56pm UTC](https://discuss.bluerobotics.com/t/qgroundcontrol-battery-indictor/16558/1 "2024-04-07T19:56:32Z")
Hi,
I’m using the latest version of Qgroundcontrol to operate our Blue ROV 2 vehicle. I use Blue Robotics supplied LI-4S-15.6AH-R1 Lithium 14.8v 15.6AH batteries to power the ROV. My issue is that both batteries are fully charged prior to installation using the Blue Robotics charger. When I connect either battery to the vehicle the QGC software reports 100% charge, which confirms the BRC reading. The vehicle is deployed for Ops, but after approx. 10 mins of ops the QGC battery monitoring indicator drops from 100% to 0%. This happens with both batteries. I recovered the vehicle to check the battery status and in both instances the batteries were nearly 80% charged. Has anyone else experienced this type of issue before? I recharged both batteries to 100% and tried again, same result. Instead of recovering I continued operating for a further 20 minutes. I recovered the vehicle and checked the charge level. 68%.
I tested both batteries with similar results observed on the Battery Cell Checker. Readings listed below.
1S - 4.164V
2S - 4.162V
3S - 4.161V
4S - 4.181V
Are my batteries the issue or the QGC monitor? I’m leaning towards the QGC software, but I’m a novice when it comes to Lithium batteries. Probably a dumb question, but better to ask.
lee
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### Author:  [@tony-white](https://discuss.bluerobotics.com/u/tony-white)
#### Post date: [April 7, 2024, 11:50pm UTC](https://discuss.bluerobotics.com/t/qgroundcontrol-battery-indictor/16558/2 "2024-04-07T23:50:01Z")
Hi @Lcolville77 -
The issue is definitely related to QGround Control! You need to properly set your battery capacity within the program. To do so, go to Vehicle Setup by clicking the purple Q in the upper left, and select Power on the left. Set the capacity to the correct number of mAh (15600 or 18000, depending on your battery)
Note - the vehicle assumes the battery is fully charged when powered on, so if you use half the battery and then restart the autopilot, the capacity readout will be ~50% inaccurate!
I typically prefer to set the capacity to -1, so I can monitor battery voltage directly, as mentioned [here](https://discuss.bluerobotics.com/t/autopilot-on-bluerov-not-sending-battery-info/13224).
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### Author:  [@Lcolville77](https://discuss.bluerobotics.com/u/Lcolville77)
#### Post date: [April 8, 2024, 9:06pm UTC](https://discuss.bluerobotics.com/t/qgroundcontrol-battery-indictor/16558/3 "2024-04-08T21:06:05Z")
Hi Tony,
Thanks for replying and providing me with a solution. Very much appreciated.
Kind Regard,
Lee Colville
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### Author:  [@nfored](https://discuss.bluerobotics.com/u/nfored)
#### Post date: [April 13, 2024, 4:32pm UTC](https://discuss.bluerobotics.com/t/qgroundcontrol-battery-indictor/16558/4 "2024-04-13T16:32:08Z")
I spend most my time piloting things that crash to earth when battery dies. I trust raw voltage read out over any stat. I know my crafts Voltage sag. Doing this I always land at 3.8v per cell
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### Author:  [@mattcmgb](https://discuss.bluerobotics.com/u/mattcmgb)
#### Post date: [April 13, 2024, 4:38pm UTC](https://discuss.bluerobotics.com/t/qgroundcontrol-battery-indictor/16558/5 "2024-04-13T16:38:24Z")
Agree, raw voltage per cell is the best indicator of when to recover to surface.