Best battery discharge method?

[mbsz53]

Won't that cause the MP to over-heat with the motors running while sitting still on the ground?

From varied input I've concluded that we should not discharge our batteries to the point of shutting down. My drone didn't overheat, but now I plan not to let the batteries drop below 20%. That standard eliminates having to run the drone on the ground apart from takeoff and landing.

Thanks

 

[Cheech Wizard]

If amps were a major determination, flight time would be greatly reduced. But as soon as you went into a hover, amps would drop and the flight time would be greatly increased. That would make the percentage almost worthless.

Yes AMPS (current) is part of the formula, but you won't get "Increased" flight time, once the drone is turned on it is constantly discharging.

Ohm’s Law - How Voltage, Current, and Resistance Relate | Ohm's Law | Electronics Textbook

 

[Cheech Wizard]

You say the percentage estimation of remaining capacity would be worthless if amps (current draw) “were a major determination”. I never suggested current draw was a major factor, it is one of many factors that are used by the SOC to estimate time to empty.

I would say that current draw is a MAJOR factor as to flight time. Voltage = current (Amps) X resistance (Ohms)

 

[WithTheBirds]

Yes AMPS (current) is part of the formula, but you won't get "Increased" flight time, once the drone is turned on it is constantly discharging.

Ohm’s Law - How Voltage, Current, and Resistance Relate | Ohm's Law | Electronics Textbook

You get maximum flight time at a constant flight speed or 25km/hr. Hovering is less efficient (no transitional lift).

 

[Cheech Wizard]

Where? Can you provide a couple of links please?

Ummmm, you posted this?

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[Cheech Wizard]

Fly those bartteries! You spent the money to enjoy the hobby but are diminishing the fun worrying about battery care. Golfers lose golf balls that cost 4-$5 each! Sometimes more than 1 a hole. We get peeved over some loss of battery capacity that equates to just nickels per flight? Are we not smarter than golfers? Our “golf ball” comes back with the push of a button? Enjoy. Just some perspective.

Hmmm... Transponders in golf balls? Maybe a new biz?

 

[Cheech Wizard]

You get maximum flight time at a constant flight speed or 25km/hr. Hovering is less efficient (no transitional lift).

I don't disagree with that and obviously if using Sport Mode you are also increasing Current thus running the battery down faster.

 

[Cheech Wizard]

This is a tough post to follow... everyone is commenting on different types of drone batteries... Some one mentioned that "Older DJI Batteries" aren't the same as the newer ones with NO reference as to what is "Old" and what is "New". Can't compare apples to oranges.

 

[WithTheBirds]

This is a tough post to follow... everyone is commenting on different types of drone batteries... Some one mentioned that "Older DJI Batteries" aren't the same as the newer ones with NO reference as to what is "Old" and what is "New". Can't compare apples to oranges.

You can take new as being those that implement impedance track and fuel gauging (current Texas Instruments battery monitor SOC’s)....

 

[ikumgh]

All this being said, people, dont deliberately plan to fly your battery down to 10% or even 15% unless you are aware of the consequences and risks. Not worth it to me. I plan to land at 20-25%.

Hmmm.. If this is the case, then why is DJI advertising 31mins for the mavic 2 when a pilot can't even safely fly below 25% battery, and 75% battery definitely won't give 31mins flight time,... So frustrating and misleading at the sane time from dji

 

[deleted member 877]

Ummmm, you posted this?

Yeah, and then WithThe Birds posted the link below - a much better and more comprehensive source:-

How to Prolong Lithium-based Batteries - Battery University

The author has excellent credentials.

 

[lolo780]

Hmmm.. If this is the case, then why is DJI advertising 31mins for the mavic 2 when a pilot can't even safely fly below 25% battery, and 75% battery definitely won't give 31mins flight time,... So frustrating and misleading at the sane time from dji

The M2 easily flies 31 minutes. It also exceeds the rated flight distance of 18km and signal range of 8km.

 

[tcope]

Hmmm.. If this is the case, then why is DJI advertising 31mins for the mavic 2 when a pilot can't even safely fly below 25% battery, and 75% battery definitely won't give 31mins flight time,... So frustrating and misleading at the sane time from dji

Marketing.

If that is not enough... noting they are stating is incorrect. Anyone is free to fly their drone down to 10%. DJI is not making anyone fly for less time and their claim of flight time is not correct. Same way car manufactures show you Time To Empty. They are not lying and you are free to drive until the tank is empty. This type of measurement is very common place, it's not incorrect and it is really the best way to accurately measure these types of things.

 

[deleted member 877]

The M2 easily flies 31 minutes. It also exceeds the rated flight distance of 18km and signal range of 8km.

On average for the M2 how much battery life remains after 31 minutes in the air? 5% ?

 

[Former Member]

On average for the M2 how much battery life remains after 31 minutes in the air? 5% ?

You can try it and let us know. Discretion is the better part of valor.

 

[deleted member 877]

You can try it and let us know. Discretion is the better part of valor.

Seriously?! I don't really get the point of your post. I don't own a Mavic 2 and asked a simple question.

 

[Former Member]

Seriously?! I don't really get the point of your post. I don't own a Mavic 2 and asked a simple question.

Sorry, misread your post.

 

[WithTheBirds]

On average for the M2 how much battery life remains after 31 minutes in the air? 5% ?

0

 

[WithTheBirds]

You can try it and let us know. Discretion is the better part of valor.

DJI had let us know- 31 mins if flown at a leisurely and constant 25kph in zero wind and 29mins in a hover. I have seen the hover test and it was best part or 29 mins with the throttle pegged up to hold off auto-land to best part of 0%....

 

[WithTheBirds]

Marketing.

If that is not enough... noting they are stating is incorrect. Anyone is free to fly their drone down to 10%. DJI is not making anyone fly for less time and their claim of flight time is not correct. Same way car manufactures show you Time To Empty. They are not lying and you are free to drive until the tank is empty. This type of measurement is very common place, it's not incorrect and it is really the best way to accurately measure these types of things.

The stated flight times are realised flying below 10%.

Its the same as DJI has done for probably all models, at least from phantom 3 onwards and Inspire 1 (I haven't owned the earlier models).