- Jue, 15 Nov 2007 11:55
#574703
compré dos lipos de 1300 milis 3S, 20 C de himodel, y creo que no son 20 C. Se lo he dicho a los susodichos y esto es lo que me han contestado.
Prodriais ayudarme para ver si yo estoy en lo cierto o son ellos los que me están tomando el pelo.
In the 3rd fly, it have no power. The first fly the two works correctly.I fly only for 8 minutes, to protect them. I recharge only 800 mhamp. In the second fly one of them at forth minute lose its, power. When I Recharge only charge 400 mahmps. In the thirt fly the two batterys lose its power.
I don´t know what happens.
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Wallace, Mon Nov 05 20:57:27 2007
reply to aurelio_jose_1@hotmail.com
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wxb, Tue Nov 06 13:07:59 2007
As the phenomena you mentioned is very strange, so if you are sure they got some problem, please send it back to us and we will have a check and replace for you once prove defective. (please make sure the cut-off setting of your ESC is ok, and also the charger is qualified)
You can use bubble envelope to send it back, our postal address http://www.himodel.com/en/help/help.php?question=49, please put a value no higher than $20USD when returning to avoid custom problem.
Regards,
HiModel
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Wallace, Wed Nov 07 17:02:09 2007
I went this morning to the postal service to send to you the batteries. But they told me that it cost to me 27 .-€ to send whit a minimum guaranty.In cost to me more than a new battery. Can we resolve it in another way?.
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wxb, Wed Nov 07 17:09:39 2007
I think they told you the cost via express service, it should not cost that much for standard air mail.
But anyway, no problem for resolving other way, the only reason I want you to send it back is we would like to have a test and see what went wrong, because we did not receive similar report previously.
Please let me know how do you prefer to resolve the problem.
Regards,
Wang
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Wallace, Wed Nov 07 21:13:14 2007
I try to mesure consumption during 2 or 3 minutes in medium power and I report the result. OK?
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wxb, Thu Nov 08 16:13:10 2007
Sure no problem.
Will wait.
Regards,
Wang
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Wallace, Sat Nov 10 01:15:53 2007
I made the test. Visit http://es.youtube.com/watch?v=tE0DfoLaywc to see it. You can see that amperes go down quickly,
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wxb, Sat Nov 10 14:12:13 2007
Thanks for your time of making this movie, so both the batteries can only run about 4 minutes? I noticed the ESC you used is the guard series, please try with a standard ESC without the cell voltage monitor and see if the result is also same. or, you can measure the voltages of each individual cell after the battery lose power, and see if there is any cell with a much lower voltage than the rest two cells?
Regards,
Wang
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Wallace, Sun Nov 11 23:07:18 2007
New test.
1. In a car battery 12V. to see the motor real comsuption. 16 to 17 Amps.
http://es.youtube.com/watch?v=QTh48jDzbBo
2.The esc. without the balancer conectión. All power Stick, and battery does not arrive at 20 C, may be 15 or 10 C.
http://es.youtube.com/watch?v=QCjwMns1a1U
3. in five minutes finish the battery, and it was unballanced
http://es.youtube.com/watch?v=dbsbYIkuQSo
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wxb, Mon Nov 12 09:42:16 2007
According to your data, the battery should be ok,
You said it charger at 15C or 10C, let say it charges at 15C,
when the battery charge at high rate, the capacity you can draw is around 85% to 90% of the total capacity, the higher the discharging rate, the lower the capacity you can draw, so the capacity you can gain when charging at 15C should be around 90%, then 1300mah x 90% = 1170mAh = 1.1170 AH, and when discharging at 15C, in amp = 1.3 x 15 = 19.5 A , we get the time the battery can run, T = 1.170Ah / 19.5 = 0.057 H = 3.6 minus. and when discharge at 10C, you can get 5.4 miniutes.
In theory, when discharge at 15C, for a 1300mah pack, there is no way to last longer than 4 minutes. You can calculate it.
Regarding the unbalance, then the difference is not big, then it is normal, as there are no two cells are exactly same.
Regards,
Wang
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Wallace, Mon Nov 12 17:55:48 2007
I charge the battery at 1C.(1.3 amps/h). The discharge is less than 15C. In your acount 10 C, because is no way to last longer than 4 minutes. In the last video you can see that crono show 5 minutes in use. I buy two batteries 20C not 10 C. The esc with the balancer cut in 4 minutes in normal consumption. Whitought esc balancer in 8 minutes.Why?.
And also you can see that batteries not arrive to 16 17 amps that motor need never
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wxb, Mon Nov 12 21:16:18 2007
I am quite confused with your questions.
You run it about 5 minutes, it means your application draw lower current then 15C, that is all, and how much C you can draw is not only depending the battery, but also directly related to your application, it does not mean as long as it is a 20C pack, then it will discharge at 20C, 20C means the max current the battery can withstand, if the resistance of your application is big, that is very normal that it may charge at 15C or 10C or lower.
Regards,
HiModel
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Wallace, Tue Nov 13 17:53:29 2007
when I connect the car's battery, 12 V. the motor needs 16 or 17 amps. It means that, it need the 16 amps, and the esc and pb battery can give it. it was the lipo battery who can not give this amps, only 10 how you recognice. Then, was the battery that was 10 o 15 C. I pay for 20 C.
If you can not see this problem was probably because you dont like give me a solution. If it was your consideration. I only can say that you can Miss one client, and a lot of friends.
I'm sorry but I'm angry with you
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wxb, Thu Nov 15 09:19:01 2007
Dear Sir,
Please, just go for someone who is good at electrical theory, they can explain to you.
I confirm again this pack is a 20C pack, but it does not mean when you connect to any circuit, then it will charge at 20C, things not work this way, it depending on the resistance of your circuit, if you test with a adjustable-resistance instrument, then you can test the battery and see if it can charge at 20C.
Also please bear in mind, you mentioned when you connect 12V, the motor run at 16 or 17 amps, but working voltage of the 3-cell Lipo is only about 10.5V under high discharging rate, how do you expect it can draw as much as that of under 12V? The current = voltage / resistance, the lower the voltage, the smaller the current, it is simple.
Please, we are fully responsible if our products really have problem, just consult to someone else you trusted and good at electornics, and show them what I explained, they will tell you if I am right or just cheating you.
Regards,
Wang
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wxb, Thu Nov 15 09:22:02 2007
In other words, for the same system, even you put a 40C lipo 11.1V battery (if available), the amp also less then the amps when you use 12V battery.
and if you want to increase the power, you need to increase the voltage to get more current.
Prodriais ayudarme para ver si yo estoy en lo cierto o son ellos los que me están tomando el pelo.
In the 3rd fly, it have no power. The first fly the two works correctly.I fly only for 8 minutes, to protect them. I recharge only 800 mhamp. In the second fly one of them at forth minute lose its, power. When I Recharge only charge 400 mahmps. In the thirt fly the two batterys lose its power.
I don´t know what happens.
Back to Top
Wallace, Mon Nov 05 20:57:27 2007
reply to aurelio_jose_1@hotmail.com
Back to Top
wxb, Tue Nov 06 13:07:59 2007
As the phenomena you mentioned is very strange, so if you are sure they got some problem, please send it back to us and we will have a check and replace for you once prove defective. (please make sure the cut-off setting of your ESC is ok, and also the charger is qualified)
You can use bubble envelope to send it back, our postal address http://www.himodel.com/en/help/help.php?question=49, please put a value no higher than $20USD when returning to avoid custom problem.
Regards,
HiModel
Back to Top
Wallace, Wed Nov 07 17:02:09 2007
I went this morning to the postal service to send to you the batteries. But they told me that it cost to me 27 .-€ to send whit a minimum guaranty.In cost to me more than a new battery. Can we resolve it in another way?.
Back to Top
wxb, Wed Nov 07 17:09:39 2007
I think they told you the cost via express service, it should not cost that much for standard air mail.
But anyway, no problem for resolving other way, the only reason I want you to send it back is we would like to have a test and see what went wrong, because we did not receive similar report previously.
Please let me know how do you prefer to resolve the problem.
Regards,
Wang
Back to Top
Wallace, Wed Nov 07 21:13:14 2007
I try to mesure consumption during 2 or 3 minutes in medium power and I report the result. OK?
Back to Top
wxb, Thu Nov 08 16:13:10 2007
Sure no problem.
Will wait.
Regards,
Wang
Back to Top
Wallace, Sat Nov 10 01:15:53 2007
I made the test. Visit http://es.youtube.com/watch?v=tE0DfoLaywc to see it. You can see that amperes go down quickly,
Back to Top
wxb, Sat Nov 10 14:12:13 2007
Thanks for your time of making this movie, so both the batteries can only run about 4 minutes? I noticed the ESC you used is the guard series, please try with a standard ESC without the cell voltage monitor and see if the result is also same. or, you can measure the voltages of each individual cell after the battery lose power, and see if there is any cell with a much lower voltage than the rest two cells?
Regards,
Wang
Back to Top
Wallace, Sun Nov 11 23:07:18 2007
New test.
1. In a car battery 12V. to see the motor real comsuption. 16 to 17 Amps.
http://es.youtube.com/watch?v=QTh48jDzbBo
2.The esc. without the balancer conectión. All power Stick, and battery does not arrive at 20 C, may be 15 or 10 C.
http://es.youtube.com/watch?v=QCjwMns1a1U
3. in five minutes finish the battery, and it was unballanced
http://es.youtube.com/watch?v=dbsbYIkuQSo
Back to Top
wxb, Mon Nov 12 09:42:16 2007
According to your data, the battery should be ok,
You said it charger at 15C or 10C, let say it charges at 15C,
when the battery charge at high rate, the capacity you can draw is around 85% to 90% of the total capacity, the higher the discharging rate, the lower the capacity you can draw, so the capacity you can gain when charging at 15C should be around 90%, then 1300mah x 90% = 1170mAh = 1.1170 AH, and when discharging at 15C, in amp = 1.3 x 15 = 19.5 A , we get the time the battery can run, T = 1.170Ah / 19.5 = 0.057 H = 3.6 minus. and when discharge at 10C, you can get 5.4 miniutes.
In theory, when discharge at 15C, for a 1300mah pack, there is no way to last longer than 4 minutes. You can calculate it.
Regarding the unbalance, then the difference is not big, then it is normal, as there are no two cells are exactly same.
Regards,
Wang
Back to Top
Wallace, Mon Nov 12 17:55:48 2007
I charge the battery at 1C.(1.3 amps/h). The discharge is less than 15C. In your acount 10 C, because is no way to last longer than 4 minutes. In the last video you can see that crono show 5 minutes in use. I buy two batteries 20C not 10 C. The esc with the balancer cut in 4 minutes in normal consumption. Whitought esc balancer in 8 minutes.Why?.
And also you can see that batteries not arrive to 16 17 amps that motor need never
Back to Top
wxb, Mon Nov 12 21:16:18 2007
I am quite confused with your questions.
You run it about 5 minutes, it means your application draw lower current then 15C, that is all, and how much C you can draw is not only depending the battery, but also directly related to your application, it does not mean as long as it is a 20C pack, then it will discharge at 20C, 20C means the max current the battery can withstand, if the resistance of your application is big, that is very normal that it may charge at 15C or 10C or lower.
Regards,
HiModel
Back to Top
Wallace, Tue Nov 13 17:53:29 2007
when I connect the car's battery, 12 V. the motor needs 16 or 17 amps. It means that, it need the 16 amps, and the esc and pb battery can give it. it was the lipo battery who can not give this amps, only 10 how you recognice. Then, was the battery that was 10 o 15 C. I pay for 20 C.
If you can not see this problem was probably because you dont like give me a solution. If it was your consideration. I only can say that you can Miss one client, and a lot of friends.
I'm sorry but I'm angry with you
Back to Top
wxb, Thu Nov 15 09:19:01 2007
Dear Sir,
Please, just go for someone who is good at electrical theory, they can explain to you.
I confirm again this pack is a 20C pack, but it does not mean when you connect to any circuit, then it will charge at 20C, things not work this way, it depending on the resistance of your circuit, if you test with a adjustable-resistance instrument, then you can test the battery and see if it can charge at 20C.
Also please bear in mind, you mentioned when you connect 12V, the motor run at 16 or 17 amps, but working voltage of the 3-cell Lipo is only about 10.5V under high discharging rate, how do you expect it can draw as much as that of under 12V? The current = voltage / resistance, the lower the voltage, the smaller the current, it is simple.
Please, we are fully responsible if our products really have problem, just consult to someone else you trusted and good at electornics, and show them what I explained, they will tell you if I am right or just cheating you.
Regards,
Wang
Back to Top
wxb, Thu Nov 15 09:22:02 2007
In other words, for the same system, even you put a 40C lipo 11.1V battery (if available), the amp also less then the amps when you use 12V battery.
and if you want to increase the power, you need to increase the voltage to get more current.