Since it is imperative when planning auto missions to know your flight times I have been testing with stabilize/loiter hovers and measuring air time while I familiarize myself with the Arducopter platform.

I now have 17 full flights with respect to battery failsafe at 10.5 volts. I bought 3 batteries with the IRIS.

On these batteries the best hover time I can get is 10.5 to 11 minutes.

Yesterday I bought a more expensive Thunder Power RC G6 Pro Performance 3850mah 45C battery and a HI-Tech X1 MF balance charger. On the first flight with that battery I got 13 minutes hover/loiter. I hope to try it again today. Maybe it will get better after a couple of cycles. I only charged it with 1.9 amps for the first charge.

BTW - The $74 I spent on the charger was worth it. It charges the IRIS 3500 packs in an hour at 2 amps(well below 1C). The stock charger was taking 2.5 hours. it also displays the individual cell voltages and has a storage charge feature.

All battery tests were done with no payload. No legs, no camera, just like it comes out of the box.

I am curious to know what others are getting. The IRIS was advertised 10 to 15 minutes flight time. Assuming that it means 15 minutes with no payload and 10 minutes with legs and gimbal I would obviously like to be at 15 minutes with no payload. Doesn't seem possible as delivered.

Thanx,

mp

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i have this 5000 from HK.

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=...

Size: 146 x 50 x 25mm  

the thickness is fine, the width makes it snug in the foam, the length is ok but probably the longest i would go.  ive had a few flights now with it and have been getting over 17mins with a gopro 3 in the waterproof case on the front.  

i also got bored and took my iris apart, and i took some pictures of the inside of the battery compartment, the front section has a piece of foam that could be cut down to allow a longer battery to fit into the compartment,  the only problem is that the 2 threaded inserts for the front gopro mount stick down into the battery compartment around 3mm or so.  either these would need to be removed, or a battery that is not as thick could be used. 

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17 minutes nice!  Can these be charged with the stock charger?

That is very good time,  do you have any logs from the SD  I would like to compare them to mine.  the stock batteries are not reporting good as everyone knows.  I am being sent a battery to test sometime this week so maybe we will find something that will help.   But if I could get 17 minutes flying around that would make me happy.  Not sure what it would be with my Gimbal and Legs?

Yes but it would take a few hours, I never even took the stock charger out of the box but I've heard the output is rather weak.

heres a screenshot of the voltage and total current of the first full flight of the pack.  this run was before i calibrated the voltage readings, they were .1-.2 low, now they are more accurate.

Thanks.  And sorry for the novice question but what kind of charger is adequate? Can anyone recommend one?

As long as your willing to learn, there are no stupid questions.

There's plenty of decent chargers out there, a decent rule of thumb is to get one that's capable of charging your biggest battery at 1c, so for a 5000mah battery, you want something that's capable of 5a, you also have to be mindful of power input requirements, quite a few are DC only and will require a power supply to charge at your house.

I have a thunder ac6, nothing too special but it gets the job done, and accepts ac/DC input for at home and out in the field.

Received the Zippy 5000 from Amazon yesterday, soldered on the XT-60's, topped of the charge and performed a loiter hover. 16 minutes. One strange thing is that when I recharged the battery last night the charger cut-off and said "overcharge warning". The charger was set for a 5000mah limit. It had calculated that it put in more that 5000mah based on time and current. I was charging at 1C.

The time may go up after a few cycles but the batt was only $38. The stock batts gets 10 minutes which means I got a 60% increase in flight time for a battery that cost the same amount as the stock battery. I will update after a few more cycles. On the stock batteries my times went up by about 5% after 5-7 cycles.

The hover current was 14 to 15 amps while stock battery is 12.5 to 14. Obviously the extra weight causes the higher draw at hover.

mp

What configuration of Iris - camera, tarot, log legs etc?

My charger did the same cutoff, I believe its from these batteries slightly underrated. After my charger shutoff, I restarted it and it put another 500 mah into the battery.

Where are you guys tweaking the battery config, and what values do you use to account for a higher mAh battery?

-Joe

Sorry. All my flight testing is with out of the box Iris. No payload.

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