Barely a year after purchase, starting to get a little difficult to charge the batteries, starting to think that the "intelligent" battery monitoring has some real parasitic load on them as they seem to self-discharge much faster than my "unattended" drone batteries.
Has gone so far that two of the batteries no longer respond to the charger. So ... is it supposed to buy battery packs every year? The battery pack for my second drone (Custom, 2 kg AUW, 4S1P: 14.4V 8000 mAh) still holds ~ 80% of the original capacity, as it is kept cool and charged to 50% state-of-charge when not in use ... Is this even possible with "intelligent" batteries?
PSA: If you plan to buy "DJI Care", this should be done within 48 hours of activation. (If it has taken longer, however, there is a method on DJI's website.)
PSA: Check current and future legislation before purchasing, and please fly respectfully and educate the public about what is allowed. There are so many misconceptions out there.
Has not directly been flying weather lately. Can recommend the free version of the Android app "UAV Forecast", shows on a screen if it is "good to go", with personally configurable parameters. (No affiliation, was just happy with the discovery.)
Landing points can be a few centimeters too short for take-off in grass, 3D-printed a couple of these:
https://www.thingiverse.com/thing:4072132 (Not tested yet due to weather.)
https://www.thingiverse.com/thing:4007886 (Tested these, works well, no significant impact on flight time)
Also bought a small LED strobe of just over 10 grams, as the quad is a little difficult to see and follow after about 100 m. Not tested yet, weather * n, will return. ;)
Read a lot about flyaways on Mavic Pilots (https://mavicpilots.com/), the main common denominator seems to be underestimated wind speed at higher altitudes. Comments about compass calibration and GPS locks also occur, but wind speed seems to be a bigger problem, claim some who seem to have experience in analyzing device logs.
(Can not speak louder than that, but if we succeed in preventing a flyaway, I'm happy.)
Runs with Galaxy S9 +, 128 GB uSDXC. (https://classic.prisjakt.nu/produkt.php?o=5214822)
Previous experience: Real> 2 kg AUW QuadCopter with several analog video links and telemetry, built for heavy duty. ~ 100h flight time (+ 300h in simulator) (Master of Engineering).
+++ Absolutely wonderful flight time, gets out a bit over 25 minutes on full batteries, mixed flight style and speed, C / P / S, in winter temperatures around 1-2 Celsius.
+ Overall really nice quality of unit, gimbal, motors, TX / transmitter. The chassis is relatively solid and stable for being of such a thin material.
+ Very well-proven batteries. Samsung INR18650-25R5 (Green).
- Possibly lacks a slightly better sorting system in the bag, the accompanying containers of paper are not rugged or transparent. 3D-printed other containers from Thingiverse.
Togglebar lighting would have been nice, e.g. bright 0604 LEDs had not added significant weight, could have cut a few grams by installing a heatsink instead of heatspreader on the CPU.
- The machine does NOT appear as a memory card reader (MSD) if it is connected directly to a computer. Charging only.
- Somewhat low "ground clearance", probably weight saving. There are higher racks for 3D printing.
- The DJI app seems to log quite huge amounts of data, likes the data itself, but some of this seems to be uploaded even if you are opted-out from their tracking in the app.
(- Extra batteries are relatively expensive at the time of writing, ~ @ 400 SEK per battery)
(- USB micro-B, not USB-C)
~ Wondering if it would be possible to "unlock" the effect if you have a radio license ... At first glance, it is the same model that is sold in both the EU and the US, but the effect is limited per software in our model. (Update: Other hardware)
The included charger seems to be optimized for size, not for the fastest possible charging time. Charges at ~ 0.66C, for a charge time of around 90 minutes per battery.
According to DJI's specifications, however, they should be able to be charged in 24W, corresponding to ~ 1.39C, and means a full charge of ~ 43 minutes. Which the battery manufacturer Samsung's specifications agree with. (2.5Ah @ 4A ~ 37.5 min)
~ A battery capacity of 17.28 Wh (62 kJ), together with a battery life of> 25 minutes gives an average power of around 41 W. Weight of 250g then gives an efficiency of 6g / Watt. (Compare with larger quads that reach 10-15 g / W)
Rumor has it that the quadrant hovering RPM is around 9500.
Cell: Samsung INR18650-25R5 (Green), SDI, 6 JL1T
Max. continuous discharge current: 22A
Safe pulse discharge ratings: 95A <0.5 sec, 65A <1 sec, 40A <5 sec, 30A <6 sec
Nominal capacity: 2500 mAh
Nominal voltage: 3.6 V
Discharge end voltage: 2.5 V
Charging voltage: 4.20 +/- 0.05 V
Standard charging current: 1.25 A
Rapid charge: 4A (37.5 min)
Length: 65.85 mm
Diameter: 18.33 mm
Weight: 45.0 g
~ Nice compact bag that comes with Fly More Combo, however, should look for a hardcase with space for locks.