Thought to share this experience with you.
I was flying the MPP in the mountains and was already on the way back to HP. 4th mission on that day and despite the complex terrain, shots were awful under almost perfect weather conditions, sunny, low wind and no turbulences. Status was nominal, maybe with the exception of a minimal increase of battery depletion towards the end of the flight.
At 833 sec into flight, with forward throttle at 15 m/s / 10mph, the screen suddenly became frozen except the downward link indicator, which went to "0". Totally surprised of this occurance, I realized the absence of the noise as well. There was still a small hope for RTH, however the MPP never came back.
At that time I had no idea what might has happened. Maybe touched a tall tree? Unfortunately, the last recorded position was downhill towards a steep rocky slope - not accessible without taking high risks. So far, attempts to even get close to the probable crash site failed.
At home I started evaluating the FlightLog - and it soon became clear. Battery cell 3 has collapsed (see chart).
Ongoing thanks to @BudWalker for having created the valuable and easy to use "CsvView" !
Background:
The MPP was purchased a couple of months ago via eBay. It came along with 2 batteries, one original DJI and another 3rd party clone. The latter one had 9 charging cycles with 3 cycles added by me. Parameters looked ok so far, cell [v] deviation and overall status green to yellow.
Personally, I treat batteries as commonly recommended - with one exception. Dependent on the mission profile, flights are frequently extended below 10% remaining charge. Nevertheless, never had any battery failure during the recent years.
My Conclusion:
Apparently,I have underestimated the risk towards the battery low voltage area. So, it is reasonable to avoid ending up well below ~ 15 %. More frequent Battery Healt checks might be a good idea as well together with monitoring the cell [V] during flights . Given this example, there would have been a reaction period of ~30 sec for an emergency descend in case of significant cell deviation.
Difficult to say whether it is related to the brand of the battery. According to the seller, it was purchased in 2020 from Amazon with overall good rating.
Painful loss anyway...
I was flying the MPP in the mountains and was already on the way back to HP. 4th mission on that day and despite the complex terrain, shots were awful under almost perfect weather conditions, sunny, low wind and no turbulences. Status was nominal, maybe with the exception of a minimal increase of battery depletion towards the end of the flight.
At 833 sec into flight, with forward throttle at 15 m/s / 10mph, the screen suddenly became frozen except the downward link indicator, which went to "0". Totally surprised of this occurance, I realized the absence of the noise as well. There was still a small hope for RTH, however the MPP never came back.
At that time I had no idea what might has happened. Maybe touched a tall tree? Unfortunately, the last recorded position was downhill towards a steep rocky slope - not accessible without taking high risks. So far, attempts to even get close to the probable crash site failed.
At home I started evaluating the FlightLog - and it soon became clear. Battery cell 3 has collapsed (see chart).
Ongoing thanks to @BudWalker for having created the valuable and easy to use "CsvView" !
Background:
The MPP was purchased a couple of months ago via eBay. It came along with 2 batteries, one original DJI and another 3rd party clone. The latter one had 9 charging cycles with 3 cycles added by me. Parameters looked ok so far, cell [v] deviation and overall status green to yellow.
Personally, I treat batteries as commonly recommended - with one exception. Dependent on the mission profile, flights are frequently extended below 10% remaining charge. Nevertheless, never had any battery failure during the recent years.
My Conclusion:
Apparently,I have underestimated the risk towards the battery low voltage area. So, it is reasonable to avoid ending up well below ~ 15 %. More frequent Battery Healt checks might be a good idea as well together with monitoring the cell [V] during flights . Given this example, there would have been a reaction period of ~30 sec for an emergency descend in case of significant cell deviation.
Difficult to say whether it is related to the brand of the battery. According to the seller, it was purchased in 2020 from Amazon with overall good rating.
Painful loss anyway...
