Of course, take a look at hobbyking.com. Note that increase in weight from the battery will affect performance. I dont know for sure but generally it should be fine to use a 4S.
3dr specifically states not to use 4s, the increased voltage can damage some components.
Whether this applies only to the Iris+ or both version is unclear to me.
Well, since he asked nine months ago he's probably sent four or five of them up in green smoke ... :=)
Or it isn't the Iris+ and can tolerate the difference.
The concerns are solely about the gimbal electronics according to the IRIS+ manual and a 12V sbec takes care of that concern.
HOWEVER those attempting 4S are advised to use xcoptercalc.ch and note the amp draw with the IRIS+ propellers and 4S prior to attempting.
Its over the limit of the 4-1 ESC with the IRIS+ propellers.. a smaller diameter or less in pitch propeller will need to be used to attempt to bring the amp/power equation in line for 4S if you are the type to experiment and of course you will have to worry about hover level power etc.
but its not an absolute no.. its just one should be familiar with a DVM and things like amp draws before proceeding down this path and again NO 4S voltages on the gimbal electronics ,
12V only(regulated even better)..
ps 3DR engineer/technician dialogue invited on this subject especially if above not so.. ie other components besides gimbal cant handle 4S?
pss mine supposed to be here after Oct 7 so will run some tests and post on same either here or christian's blog cloudsurfer.net
The Turnigy 3s 5000mah fits very nice in the back and the Iris operates as it should very nicely.
Perhaps it should be mentioned for the benefit of newer folks that the original question had nothing to do with 3S vs 4S (increased voltage and thus increased RPM/performance) but was asking about increased amperage (mAh capacity and thus longer flight time). The electronics and motors couldn't care less about capacity. Mr. Pixhawk has no idea if he's being fueled by a 2000 mAh 3s or a 8000 mAh 3s. But the latter may leave the aircraft unable to get off the ground, or make it handle like an Emu. So, the considerations for battery capacity/size are totally dependent on weight and sometimes physical size/shape, and their effects, and nothing else.
Generally mass-produced R/C aircrafts' battery sizes are the result of striking compromises between performance and endurance and weight and lifting capacity and so on. A particular aircraft's balance of these factors can often be altered by changing to a different size battery (paying attention to maintaining a proper center of gravity). A bigger battery, up to a point, will result in longer flight times, but less performance and lifting capability. A smaller battery can turn a sluggish aircraft into a hotrod, or increase payload, but at the expense of shorter flight times. Those of us who build or customize our own multicopters rather than flying off-the-shelf vehicles spend a lot of time deciding what batteries to use, and it's not as simple as it might seem (and voltage, along with discharge "C" ratings do of course also enter the picture).
"Mr. Pixhawk has no idea"
Lets hope Mr Pixhawk does because that weight change from 2000mAh to 8000mAh is going to have a dramatic effect on handling and flight time =)
That's good to know, currently the Iris+ appears to be shipping with a 3s 5100mAh, it would be nice to have a 3rd party battery to use as well.
I am using thunder power 4400mAh 25C G8 pro lite, getting 12 mins on a plain iris (no loads, only telemetry radio)