Circles are no fun.As I said I have seen this happen with my own eyes, with a battery not fully charged in auto discharge
Hi,
I am often in the field with batteries charging on two car chargers, and lots of great photographic opportunities happening. I will, on occasion, fly before my battery has fully charged and I have not had issues.
So, you think it took more than 4 days to auto discharge? That's odd. How could you tell it was still auto discharging at that point?Auto discharge set to 10 day, it was about 14, took off at 65%.
Couldn't you prove or disprove this theory by looking at the battery cells in the DJI GO app?My understanding is the last bit of the charging is about levelling the cells. stopping the charging early means this is the bit that isn't happening. So (in a theoretical extreme example to emphasis the point) a battery that shows 80% charge could have 3 cells at 90% and one cell at 50%. The more often you stop the charging process before its completely finished the more of a risk this could become.
My understanding is that if you fly a battery from 100% to 60% or whatever, you're safe to use it again[provided you monitor voltage - ALWAYS ALWAYS ALWAYS monitor voltage] provided you use it again WITHIN 24 hours.
Another reason they drop when not fully charged [in my opinion] is due to cold weather and/or someone jamming the throttle to full up which sucks power down below 3.3volts, which causes the battery to auto-shutdown. Full throttle isn't a problem with 4volts, but when you're at 3.7v already, that full throttle could be the kiss of death.
DISCLAIMER: these are my opinions and theories, not necessarily facts.
Auto discharge set to 10 day, it was about 14, took off at 65%.
1 minute later critical power warning.
I landed very quickly from 100m or so.
Charged battery and flew fine next day.
My understanding is that if you fly a battery from 100% to 60% or whatever, you're safe to use it again[provided you monitor voltage - ALWAYS ALWAYS ALWAYS monitor voltage] provided you use it again WITHIN 24 hours.
Another reason they drop when not fully charged [in my opinion] is due to cold weather and/or someone jamming the throttle to full up which sucks power down below 3.3volts, which causes the battery to auto-shutdown. Full throttle isn't a problem with 4volts, but when you're at 3.7v already, that full throttle could be the kiss of death.
DISCLAIMER: these are my opinions and theories, not necessarily facts.
Check out this thread.Noob here. Can you tell me what the voltage should be and at what point should I be concerned and bring it back?
It seems this is what DJI believes is happening since they made changes in the latest firmware to throttle the power when needed.If the load is too great the volts will drop below the needed requirement. Hence a shut down.
Your assumption is not correct. If this is true, no one would be able to fly at 50% charge ever. Secondly a good battery is capable of delivering rated current at up to low charges safely without creating voltage drops. Additional Voltage drops will occur if there are poor connections or ESC is unable to limit the currents. Good battery will have its internal resistance within the specified limits.In dumb batts the charger balances the cells constantly all the way to full. From my exp pushing a 50% chgd batt hard by flying hard will create enough of a voltage drop to under power a receiver. In fixed wing immediatly flying easy will allow the batt volts to return so the rx will initialize and come bak online. Hence u dont fall from the sky due to gliding w fixed wing. Quads on the other hand dont glide. Batt voltage is dependant on the load its being ask of. If the load is too great the volts will drop below the needed requirement. Hence a shut down. Which for quads is a bad thing. Thots??
And we go round and round in circles yet again.
As I said I have seen this happen with my own eyes, with a battery not fully charged in auto discharge, critical voltage warning after 1 minute of flying.
There are two very simple ways to avoid this problem:
- Update to the latest firmware. It's not 100% certain it is fixed but DJI indicated they made changes to address it.
- Do not fly on partially charged batteries that have been sitting for a long period (e.g. > one day).
Note: It is OK to fly on partially charged batteries if you use them right away. On set, we take off, shoot and land multiple times on one battery. Not a problem.
The flight controller and receiver typically run on 5 v. As long as the total voltage of the pack is above 5v the voltage regulator will supply enough voltage to the FC and receiver.In dumb batts the charger balances the cells constantly all the way to full. From my exp pushing a 50% chgd batt hard by flying hard will create enough of a voltage drop to under power a receiver. In fixed wing immediatly flying easy will allow the batt volts to return so the rx will initialize and come bak online. Hence u dont fall from the sky due to gliding w fixed wing. Quads on the other hand dont glide. Batt voltage is dependant on the load its being ask of. If the load is too great the volts will drop below the needed requirement. Hence a shut down. Which for quads is a bad thing. Thots??
Your number 2 'advice' is NOT 100% correct!!
Nor is your "note" correct, either.
If all of this is true, then I'm assuming we'll see the same rate of failure even for those running firmware 1.6. Only time will tell now I suppose.The common denominator is the auto-discharge. If your battery begins auto-discharge, and you don't recharge it, it has a good chance of shutting down in mid flight.
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