Another super helpful video for folks, well done. This is super important and often overlooked which can result in damaged packs or worse lost quads… I usually do a quick comparison of the Charged mAh to my OSD after each flight, and to anyone that can’t get it perfect, error on the high side, so your Current and mAh used are higher than real-life. This will creat a little extra safety net. Thanks for making this video! Cheers!
Great info! I wish there was a way for this to "just work" regardless of the payload/battery choice but maybe Betaflight will figure that out one day. For now I'll try your method! My OSD is certainly WAY off from reality (or what my charger says at least).
It should be noted that when charging the battery back up after getting your initial OSD mAh reading to see the charger in non-balancing mode. This will prevent extra mAhs from getting put in due to balancing of the cells. It's recommended to only do this with batteries you trust (new versus worn batteries) to get a better current scale number.
I've chased this for a long time. The best it will get is "somewhat close', within about +/-200mah. Like you said, different batteries have different internal resistance, if you change # of cells it will be off by more. How fast you discharge i.e. Acro vs cruising. Ive found a number where some batteries are a little high and some are a little low. As batteries age you won't get as many mah out of them before they sag. The thing is to leave yourself some reserve and watch the cell voltage.
Yeah best to keep an eye on both mah and voltage. Some of my lipos of same capacity have worse IR so i cant draw same amount of mah out of the higher IR packs before voltage sags.
What if fc shoes consumption in the 1 to 2 amps just sitting while in the setup; battery conected, but no arm no vtx? I see numbers jumpung in those ranges
This is very useful - thanks for posting this .Quick question - if you have a 1000 mAh capacity battery, how many of those mAh do you want to use to be safe (for returning the quad and to avoid battery damage). Thanks.
Thanks for watching. It really varies with the manufacturer of the cell and the cell type. I download the specs white paper which gives the lower limits. I use packs using 18650 or 21700 Liion cells and my rule of thumb is 80pct to 85pct max draw of the rated amps. my 10000mah packs i land by 8000 or worst case 8500.
Just want to add you need to calibrate the Amp meter to your flying style. Heavy on the throttle will produce different results in calibration vs slow flying.
So the formula I used was inversed. Bf*charger/osd. The correct is bf*osd/charger. I have question though. Why a different battery would need a different calibration? Let's say they're identical sony vtc6 packs, is that because of battery health? Another q, can we do calibration even though we sample flight only. Say lipo 1.8Ah, I'll fly for 30 seconds, record osd, charge my battery maybe now at 80% then to 100%, record and do the calibration. Seems I'm not violating the formula? Many many thanks.
@@ValleyFPV thank you too. Your method of complete draining the battery to calibrate is perfect. Fact is, I can't do a test 4x in 1 session coz I'm casual flyer only. 1pack LR is best I can do in 2 weeks. My idea though may not be accurate because of fast draining when low bat level compared to full.
Thank you for great content, once again. Can you tell me what kind of % of a pack you utilize? If your pack is 6000mah, do you draw 5000mah? Or what's your rule? *Thumbs up*
Thanks for watching. I touch on this very subject in another video which will be posted online within 24 hours. Watch for that. I explain why, how I calculated it; the short answer is for this LIION pack and these cells, approximately 86% or around 5200mAh
Thanks for watching. The battery cells that my pack is made of have a low voltage cutoff limit of 2.5v per cell. One benefit of some Liion cells over LIPO cells.
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Great idea to create excell for that kind of stuff! Thanks for the video
Another super helpful video for folks, well done. This is super important and often overlooked which can result in damaged packs or worse lost quads…
I usually do a quick comparison of the Charged mAh to my OSD after each flight, and to anyone that can’t get it perfect, error on the high side, so your Current and mAh used are higher than real-life. This will creat a little extra safety net.
Thanks for making this video! Cheers!
Yep, good suggestions.
Excellent! Thank you.
Thanks for watching
Great info! I wish there was a way for this to "just work" regardless of the payload/battery choice but maybe Betaflight will figure that out one day. For now I'll try your method! My OSD is certainly WAY off from reality (or what my charger says at least).
Thanks for watching. Yes this method assumes that the charger is accurate. Suppose that is better than nothing
It should be noted that when charging the battery back up after getting your initial OSD mAh reading to see the charger in non-balancing mode.
This will prevent extra mAhs from getting put in due to balancing of the cells. It's recommended to only do this with batteries you trust (new versus worn batteries) to get a better current scale number.
Sounds reasonable
I've chased this for a long time. The best it will get is "somewhat close', within about +/-200mah. Like you said, different batteries have different internal resistance, if you change # of cells it will be off by more. How fast you discharge i.e. Acro vs cruising. Ive found a number where some batteries are a little high and some are a little low. As batteries age you won't get as many mah out of them before they sag. The thing is to leave yourself some reserve and watch the cell voltage.
Yeah best to keep an eye on both mah and voltage. Some of my lipos of same capacity have worse IR so i cant draw same amount of mah out of the higher IR packs before voltage sags.
Thanks for watching and indeed your comments are true!
What if fc shoes consumption in the 1 to 2 amps just sitting while in the setup; battery conected, but no arm no vtx? I see numbers jumpung in those ranges
outstanding !
Thanks for watching
This is very useful - thanks for posting this .Quick question - if you have a 1000 mAh capacity battery, how many of those mAh do you want to use to be safe (for returning the quad and to avoid battery damage). Thanks.
Thanks for watching. It really varies with the manufacturer of the cell and the cell type. I download the specs white paper which gives the lower limits. I use packs using 18650 or 21700 Liion cells and my rule of thumb is 80pct to 85pct max draw of the rated amps. my 10000mah packs i land by 8000 or worst case 8500.
Just want to add you need to calibrate the Amp meter to your flying style. Heavy on the throttle will produce different results in calibration vs slow flying.
I'm not sure I agree.
When trying to get the number from the charger is it less accurate to charge at 2C
Thanks
Hello~ I need a old scale!~ How many old scale values should I enter? FC: MAMBA H743 / ESC 40A bls / Battery 7000Mah lipo
Thanks for watching. I do not know.
So the formula I used was inversed. Bf*charger/osd. The correct is bf*osd/charger. I have question though. Why a different battery would need a different calibration? Let's say they're identical sony vtc6 packs, is that because of battery health? Another q, can we do calibration even though we sample flight only. Say lipo 1.8Ah, I'll fly for 30 seconds, record osd, charge my battery maybe now at 80% then to 100%, record and do the calibration. Seems I'm not violating the formula? Many many thanks.
Thanks for watching. All very good points to consider. I am by no means an expert on the subject and make some good comments to consider.
@@ValleyFPV thank you too. Your method of complete draining the battery to calibrate is perfect. Fact is, I can't do a test 4x in 1 session coz I'm casual flyer only. 1pack LR is best I can do in 2 weeks. My idea though may not be accurate because of fast draining when low bat level compared to full.
Thank you for great content, once again.
Can you tell me what kind of % of a pack you utilize?
If your pack is 6000mah, do you draw 5000mah? Or what's your rule?
*Thumbs up*
Thanks for watching. I touch on this very subject in another video which will be posted online within 24 hours. Watch for that. I explain why, how I calculated it; the short answer is for this LIION pack and these cells, approximately 86% or around 5200mAh
How are you flying below 3.2v ??
Thanks for watching. The battery cells that my pack is made of have a low voltage cutoff limit of 2.5v per cell. One benefit of some Liion cells over LIPO cells.
@@ValleyFPV oh okay