Definitely glad I actually bothered to calibrate the current meter on this one now! Never bothered before when just using LiPo & I've gotten very used to that voltage behaviour, so this is all new to me.
Very nice videos - instantly subscribed after 4S pack assembly video, nice work Sir! now - I'm to follow! :) I have a question - at the end of this test flight stats showed that max current draw was 50A which is insane if you ask me as I'm planning my 4S pack (if on 18650) it'll give me like 10-13C rating only in case of top 18650 battery Molicel P26A 18650 2600mAh 35A (or 21700 - can't make up my mind yet) also a single 0.2mm by 8mm pure Ni200 strip (SSPN-0013) is rated only for max ~9-12 Amps... so if you want like fully 35Ams per pack I reckon there should be double strips on the bridges. Correct me if I'm wrong please. There were nickel strip current tests by our local Russian guy, where he tried testing single 0.1 by 4mm strip with 15A current - it'll heat up to +55C, at 30A it's about +500C (Nickel melting point is 1455C or 2651F and for 0.2mm by 8mm strip it will be a bit different) as for the batteries - they normally take up to +60C temp (charging, rapid discharging as per specs sheets) - obviously depending on the battery model. I'm on 3.5" cinelog now with 45A ESC, and planning to building 5.5 AOS on probably 55A ESC and as per my understanding these Li-Ion packs will not do sufficiently - will be too much sag due the current hungry builds and powerful motors.
You have to consider duty cycle. That maximum 50A shown on the flight summary may only have been sustained for 1/10th of a second, while for most of the rest of the flight the average was only ~25A. Doing a bench test with a continuous current & no airflow is completely different to flying with a highly variable load & ample airflow (& low ambient temperature here in Scotland!). The best thing you can do is run your own tests & see what works for your specific use case - because even small changes in usage can drastically alter the real world temperature behaviour compared to a slightly different scenario somebody else might have described online. I read things that said my packs would instantly melt, while others said they would be absolutely fine - in practice, so far, they have been fine :) Note that I never really intended to use these cells at their maximum current, they were just what I was able to buy in my country at a good price - so I don't have to worry if I can't pull 30A continuous from each cell for the entire capacity!
@@CJDavies Aha! I see, thanks for the answer, yes that seems reasonable and for the current, well... I'm now just gathering info, as I truly want to use these cells at max current, if that is even possible and safe (it's a bit safer, compared to LiPo anyways) as for LiPo packs - it's diffucult here in Russia - almost nothing is avail online, everything goes from China and delivery times up to 40 days which is sad, so that's why I'm trying alternatives, I've had previous several years of experience with LiIon packs as I used to be a vaper and we used all possible kinds of LiIon with very low resistance coils on high currents also... that's why
Hi sir I have apm2.8 with 920kv motor 30a esc f450 quadcopter and 1045 propeller I want to use the link ion battery pack for more flight time can u pls suggest me Present I am using 11.1v 2200mah battery pack I fully charge it 12.4v and 4.2v for cell with my home made li ion battery charger Iam able to get only 2min of flight time Pls help me As I hang my mobile phone weighs 137gram to record video can u plz say which like ion cell I have to use to get more flight time
You should be getting more than 2 minutes even with just a 2200mAh 3S battery. But assuming your motors, ESCs, etc. support 4S the ideal size of battery for your setup is probably around 4000mAh 4S. I wouldn't bother with LiIon unless you already have a spot welder to assemble them. You will find it much easier to find LiPo batteries in the right size.
@@sricharan7287 There is not much difference between LiPo & LiIon when it comes to safety & the care you have to take. You need to be very careful with both! You definitely should not build your own LiIon batteries unless you know exactly what you are doing.
Great summary, nice voiceover! Hope the packs continue to do good!
Voltage sag of a li-ion pack kicks in quickly when it hits below 3.2v
Definitely glad I actually bothered to calibrate the current meter on this one now! Never bothered before when just using LiPo & I've gotten very used to that voltage behaviour, so this is all new to me.
Very nice videos - instantly subscribed after 4S pack assembly video, nice work Sir! now - I'm to follow! :) I have a question - at the end of this test flight stats showed that max current draw was 50A which is insane if you ask me as I'm planning my 4S pack (if on 18650) it'll give me like 10-13C rating only in case of top 18650 battery Molicel P26A 18650 2600mAh 35A (or 21700 - can't make up my mind yet) also a single 0.2mm by 8mm pure Ni200 strip (SSPN-0013) is rated only for max ~9-12 Amps... so if you want like fully 35Ams per pack I reckon there should be double strips on the bridges. Correct me if I'm wrong please. There were nickel strip current tests by our local Russian guy, where he tried testing single 0.1 by 4mm strip with 15A current - it'll heat up to +55C, at 30A it's about +500C (Nickel melting point is 1455C or 2651F and for 0.2mm by 8mm strip it will be a bit different) as for the batteries - they normally take up to +60C temp (charging, rapid discharging as per specs sheets) - obviously depending on the battery model. I'm on 3.5" cinelog now with 45A ESC, and planning to building 5.5 AOS on probably 55A ESC and as per my understanding these Li-Ion packs will not do sufficiently - will be too much sag due the current hungry builds and powerful motors.
You have to consider duty cycle. That maximum 50A shown on the flight summary may only have been sustained for 1/10th of a second, while for most of the rest of the flight the average was only ~25A. Doing a bench test with a continuous current & no airflow is completely different to flying with a highly variable load & ample airflow (& low ambient temperature here in Scotland!). The best thing you can do is run your own tests & see what works for your specific use case - because even small changes in usage can drastically alter the real world temperature behaviour compared to a slightly different scenario somebody else might have described online. I read things that said my packs would instantly melt, while others said they would be absolutely fine - in practice, so far, they have been fine :) Note that I never really intended to use these cells at their maximum current, they were just what I was able to buy in my country at a good price - so I don't have to worry if I can't pull 30A continuous from each cell for the entire capacity!
@@CJDavies Aha! I see, thanks for the answer, yes that seems reasonable and for the current, well... I'm now just gathering info, as I truly want to use these cells at max current, if that is even possible and safe (it's a bit safer, compared to LiPo anyways) as for LiPo packs - it's diffucult here in Russia - almost nothing is avail online, everything goes from China and delivery times up to 40 days which is sad, so that's why I'm trying alternatives, I've had previous several years of experience with LiIon packs as I used to be a vaper and we used all possible kinds of LiIon with very low resistance coils on high currents also... that's why
~Land Now~ :3
Hi sir I have apm2.8 with 920kv motor 30a esc f450 quadcopter and 1045 propeller I want to use the link ion battery pack for more flight time can u pls suggest me
Present I am using 11.1v 2200mah battery pack I fully charge it 12.4v and 4.2v for cell with my home made li ion battery charger
Iam able to get only 2min of flight time
Pls help me
As I hang my mobile phone weighs 137gram to record video can u plz say which like ion cell I have to use to get more flight time
You should be getting more than 2 minutes even with just a 2200mAh 3S battery. But assuming your motors, ESCs, etc. support 4S the ideal size of battery for your setup is probably around 4000mAh 4S. I wouldn't bother with LiIon unless you already have a spot welder to assemble them. You will find it much easier to find LiPo batteries in the right size.
@@CJDavies but taking care of lipo is very hard Iam just beginer
@@sricharan7287 There is not much difference between LiPo & LiIon when it comes to safety & the care you have to take. You need to be very careful with both! You definitely should not build your own LiIon batteries unless you know exactly what you are doing.
@@CJDavies thank u bro