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03-05-2021, 08:40 PM | #21 | |
Quarry Creeper Join Date: Dec 2013 Location: The Garden State, North of I-80
Posts: 439
| Re: Total voltage when charging Quote:
As for your batteries, do you know anyone near by that may have a lipo charger with a display so you can check the various voltages? Another alternative is what you said, just get a new battery and see how it behaves on your iCharger. Just get a cheapie $15-$20 2S 5000 mAh on Amazon. I still say it's the packs and not your iCharger. Remember the many years sitting in dormancy! BTW, Nightcrawler48 does make some very good points. Last edited by Kingmeow; 03-05-2021 at 08:43 PM. | |
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03-07-2021, 04:14 PM | #22 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Total voltage when charging
It seems there is a lot of confusion around here as to how chargers actually work. 1) in order to move the electrons there must be a difference in pressure, or voltage. So if you wish to charge a battery you must have a higher voltage then the batteries current voltage. 2) You can't read the batteries voltage while it is charging. In order for your charger to see the batteries voltage it must stop charging take a voltage reading then resume charging again. 3) If you take a reading of the voltage while a battery is charging you are reading the chargers voltage, which is higher then the batteries voltage. 4) The speed of charging is most accurately measured in watts because the voltage and amps can vary. 5) Your charger should limit the voltage or amperage or both while charging a battery. 6) mid charge voltage reading are more like guestimates, because there has been no trickle charge, voltage drop occurs ass soon as the charge stops. 7) it would take a really long time to charge a cell to 4.2v if you only supply 4.2v so chargers will use over 4.2v then trickle charge as the battery reaches equilibrium. Batteries themselves form dendrites inside them which shrink and grow during different charge discharge phases. So you should always measure the IR at the same charge for comparison. As the size of the dendrites inside the battery increase, batteries IR increases. As the batteries IR increases more powered is wasted as heat inside the battery. At low amp draws the heat is dissipated relatively safely, but at high amp draws the heat can build resulting in thermal runaway and fire. |
03-07-2021, 05:46 PM | #23 | |
Rock Stacker Join Date: Dec 2020 Location: London, Ontario
Posts: 61
| Re: Total voltage when charging Quote:
Question for you (not being a smart ass, real question) When chargers are displaying voltage, all the chargers I have seen display some increasing voltage on each cell. If your above points are true then does that mean the charger stops charging every few miliseconds to read the voltage? I assumed that because Li-po chargers use a CCCV charge cycle they actually display battery voltage, (perhaps from the balance board?) because if they displayed the charger voltage they would simply display 4.2 volts for the entire time the charger is in it's second phase (Constant voltage) and that doesn't seem to be the case with any charger I have ever used. | |
03-07-2021, 06:39 PM | #24 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Total voltage when charging
Yes, most chargers will use a form of PWM for charging. Meaning they stop charging, take a reading and resume with out you knowing. as far a CCCV charging this is why I say watts are better. But the charger can go above 4.2v in order to keep the amperage up. It all depends on how a charger is programed. Because the time given to read the batteries voltage is so short, the internal chemistry hasn't has time to equalize so voltage will settle. The entire time the battery reads 4.2v is because the electrons are basically still settling (sorry I dont have a more accurate term for this) But they are not fully saturated. So the Battery read voltage will be higher then the battery voltage after even a few seconds of being disconnected to a charger. You can see this by randomly disconnecting a battery mid charge and immediately putting a voltage meter on it for 10 seconds and watching the voltage fall. Programmers could be added to adjust the voltage shown to more accurately represent the percentage of charge for a specific battery but overall it wouldn't be very accurate so you just get this quick and dirty battery reading. Fully charged is a relative term. Fully charged 4.2v at 5A is not as good as fully chard at 1A or a trickle charge, because of this saturation and settling of electrons. |
03-07-2021, 06:43 PM | #25 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Total voltage when charging
What I say is only mostly true, or sometimes true, but not always true. Its complicated. Much more complicated then I could fully comprehend for sure. As they say there are multiple ways to skin a cat. And there are certainly multiple ways to charge a battery.
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03-07-2021, 06:55 PM | #26 |
I wanna be Dave Join Date: Feb 2017 Location: My mothers basement
Posts: 2,128
| Re: Total voltage when charging
Taking a voltage reading from the balance board during charging will have a tainted reading from the higher charge voltage on the main plug.
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