All this for 1 minute of flight time! Seems like a true waste of time and effort. Just change batteries and move on.
This re-calibration is a one-time action following update to FW 1.3.0.00. This update provided for a different battery calibration algorithm that would allow for the batteries to be reset to factory specs for a full charge (i.e., 4500mAH for TB 47 and 5700 mAH for TB 48). If not accomplished, your batteries will most likely show less than those values after charge to 100%.
But it's your choice.
I fly to 10% and land, then make sure my controllers need a charge, and use the Lipo to Controller lead and charge the controllers until the batteries will no longer turn on ... So far so good using this method. Seems to completely drain the TB batteries
From what I (thought) I knew about lipos is that if they are getting that hot and cells are being damaged in the process then it means they are being discharged too far.
Maybe that "set lowest voltage" is too low if everyone is seeing very hot batteries and a loss in overall battery life after doing this recalibration procedure. I realise this would mean DJI has it set wrong so please forgive my ignorance of these smart batteries.The Inspire batteries are unlike any standard lipo you would buy from Hobbyking, or elsewhere.. They are like mobile phone batteries. They drain to a set lowest voltage then power off preserving themselves. They have very sophisticated protection mechanisms and they self power off when at the lowest safe voltage..
Ive had one hit over 70c....... flying with a 700g additional payload in approx 45 - 50c ambient temp.......The battery will get very hot. A couple of mine reached 56 deg C, which is higher than DJI specifies for battery operating temp, but it didn't seem to harm them. Cooling them with A/C will help. The measure of whether it worked is that after a full charge the capacity should reflect the full rated value, as posted above by @Scotflieger.
Normally a hot battery is a sign of it being discharged at close to or more than its max C discharge rating.Maybe that "set lowest voltage" is too low if everyone is seeing very hot batteries and a loss in overall battery life after doing this recalibration procedure. I realise this would mean DJI has it set wrong so please forgive my ignorance of these smart batteries.
M00se, please tell where do you live (no survive) to have such obscene temperatures? And they say there is no global warning....Ive had one hit over 70c....... flying with a 700g additional payload in approx 45 - 50c ambient temp.......
I fly to 10% and land, then make sure my controllers need a charge, and use the Lipo to Controller lead and charge the controllers until the batteries will no longer turn on ... So far so good using this method. Seems to completely drain the TB batteries
WP...I like your method. This worked for me with both of my batteries.
Thanks.
Correct. The CONTINUOUS discharge 100%-5% is required this once but not for 10-20 charge deep cycle.I like this method too, BUT I thought for it to recalibrate the batts it has to be a continuous drain ???
Correct. The CONTINUOUS discharge 100%-5% is required this once but not for 10-20 charge deep cycle.
I discharged my inspire 1 battery down to 1 % I then soaked in ice water to cool it now it doesn't work at all? Thanks for the bad advice!!!There seems to be a lot of confusion about re-calibrating batteries with the release notes of FW 1.3.0 stating to take batteries down to 5% then fully charging back to 100% to bring batteries back up to full capacity (4500mAH for a TB47). In my experience, 5% does not work, since after doing 5 TB47s that way with FW 1.3.0 I saw anywhere from 4100-4400 mAH capacity after charging them back to full.
So I did some research and found a post by @mixmaven on RCGroups Inspire thread here who stated that he found out from a DJI battery expert that the trick is to get the lowest cell voltage down to 3.30V, which in my case meant bringing the batteries to 0% (This has been confirmed by RCGroups DJI Forum Support @blade strike). Even then, once my motors stopped, lowest voltage climbed to around 3.40-3.45V before the voltage drained to 3.30V.
Easiest way I found to do this: Fly a fully charged battery down to around 20% (turn your battery warnings down to 15% and 10% respectively), then hover just above ground with LG down and wait for the RTH message, cancel it, and when you get the critical battery warning at 10% and the craft wants to land, just hold the throttle up to hover until it shows 3.3V (probably lower than 5% showing) and let it land. Once the motors stop, the cells will probably increase about .10V, so just leave it powered on until you see 3.30V on the lowest cell. Be mindful of battery temp while doing this, it did climb pretty high in this procedure. If in the field and once the motors stop, take off the props and put Inspire in front of the A/C vents in your vehicle. The trick, once again, is to discharge in one cycle down to the desired voltage, leaving the battery on the whole time.
That worked for me. Upon recharge to full, all my batteries showed a full 4500 mAH capacity. As mentioned elsewhere, battery life will probably drop a couple percentage points from previous value after the calibration. Since calibration, my impression is that I've gained about a minute or so in flight time on my batteries.
Don't forget to reset your battery warning levels once you go fly again!
I discharged my inspire 1 battery down to 1 % I then soaked in ice water to cool it now it doesn't work at all? Thanks for the bad advice!!!
This has been covered a few times already - you need to take your batteries down to 3.3v per cell which can be below 5 or even 3% depending on how they are calibrated currently.I was getting a warning stating that my batteries needed to be discharged to 5% then recharged. I flew until 10%, landed and left the copter on until 3%, powered down and recharged and still have the same warning. I have done this 2x per battery now and still getting the warning ??? any advice on this. Thanks in advance
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