RC-Monster Forums - View Single Post - Q: 0610iDUO - 3s FP

BrianG · 11.01.2008, 10:39 PM

Well, in the last pic, the overall curve looks right: constant current charge and voltage rises slowly until 4.2v/cell, at which time the voltage is held constant and current falls to a set shutoff value (0.1C?). The pulses must just be part of its measuring algorithm. Either that or the data capture feature isn't working quite right.

I would hook an analog meter up across the battery to see if there are in fact pulses. I say analog because the needle can sometimes show brief changes better than a digital meter due to sampling rate. If you have two meters, hook the other in series with the battery to measure current for the same reason.

I have no idea what that "noise" is at the beginning of the charge though. Maybe the charger varying the rate and monitoring the resulting voltage to ensure proper settings? If the charge rate is too high for a particular cell, there will be a large voltage difference between charge and no charge. That's the only reason I can think of...

	(#5)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	11.01.2008, 10:39 PM Well, in the last pic, the overall curve looks right: constant current charge and voltage rises slowly until 4.2v/cell, at which time the voltage is held constant and current falls to a set shutoff value (0.1C?). The pulses must just be part of its measuring algorithm. Either that or the data capture feature isn't working quite right. I would hook an analog meter up across the battery to see if there are in fact pulses. I say analog because the needle can sometimes show brief changes better than a digital meter due to sampling rate. If you have two meters, hook the other in series with the battery to measure current for the same reason. I have no idea what that "noise" is at the beginning of the charge though. Maybe the charger varying the rate and monitoring the resulting voltage to ensure proper settings? If the charge rate is too high for a particular cell, there will be a large voltage difference between charge and no charge. That's the only reason I can think of...