Lipo Charge Question
#1
I ran my lipo today till the LVC on my ESC kicked in. This is the first time that I actually reached the LVC. Anyways, when I went to charge it, and after it completed charging, the charger was blinking Lipo, Capa, Lipo, Capa. Usually, it blinks Lipo, Full, Lipo, Full. What does this mean? I also noticed that the current reading was 5000mah. That was the first time it ever reached full capacity. As for the voltages of each cell, in my previous charges, each cell reached 4.2V at full charge. This time around, one read 4.17V and the other read 4.19V. Should I be concerned about this or is this normal? Let me know, thanks...
#3
Tech Addict
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I ran my lipo today till the LVC on my ESC kicked in. This is the first time that I actually reached the LVC. Anyways, when I went to charge it, and after it completed charging, the charger was blinking Lipo, Capa, Lipo, Capa. Usually, it blinks Lipo, Full, Lipo, Full. What does this mean? I also noticed that the current reading was 5000mah. That was the first time it ever reached full capacity. As for the voltages of each cell, in my previous charges, each cell reached 4.2V at full charge. This time around, one read 4.17V and the other read 4.19V. Should I be concerned about this or is this normal? Let me know, thanks...
Nothing to worry about. Try not to run your batteries this low though, it will shorten there usable life.
Shawn.
#4
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Joined: Jun 2009
Posts: 598
From: So-Cal
What charger are you using? You probably have a charger that ask for the capacity of the the battery. This isn't a problem, just another safety feature built into the charger to stop the cycle when it reaches 5000mah. This also means that your battery is able to take more than 5000mah when completely drained. That is not a bad thing either. I think most battery company under rates thier batteries anyways. If you ever drain your battery down that far again, try setting the capacity to 5300mah if you can. If you can't then just restart the cycle again and you will probably be able to put in another 100 to 200mah. Note that when you start the second cycle, it will probably charge at a rate of 500mah or less as the pack is close to being fully charged. Hope this helps
#5
What charger are you using? You probably have a charger that ask for the capacity of the the battery. This isn't a problem, just another safety feature built into the charger to stop the cycle when it reaches 5000mah. This also means that your battery is able to take more than 5000mah when completely drained. That is not a bad thing either. I think most battery company under rates thier batteries anyways. If you ever drain your battery down that far again, try setting the capacity to 5300mah if you can. If you can't then just restart the cycle again and you will probably be able to put in another 100 to 200mah. Note that when you start the second cycle, it will probably charge at a rate of 500mah or less as the pack is close to being fully charged. Hope this helps
So, I don't know if it'll go beyond the 5000mah or if I should attempt to charge it with a higher rating. Thanks for your reply.
#6
Yeah, this was the first time that I actually hit the LVC. I've read that you shouldn't allow the lipo to get that low all the time. Thanks again for your reply.
#7
Joined: Jul 2008
Posts: 11,530
From: Houston, TX
I ran my lipo today till the LVC on my ESC kicked in. This is the first time that I actually reached the LVC. Anyways, when I went to charge it, and after it completed charging, the charger was blinking Lipo, Capa, Lipo, Capa. Usually, it blinks Lipo, Full, Lipo, Full. What does this mean? I also noticed that the current reading was 5000mah. That was the first time it ever reached full capacity. As for the voltages of each cell, in my previous charges, each cell reached 4.2V at full charge. This time around, one read 4.17V and the other read 4.19V. Should I be concerned about this or is this normal? Let me know, thanks...
Some lipo cells are underrated and will charge to higher than the labeled mah. There's nothing wrong with that. I'd set the capacity default higher and see just how much the batt does take before the voltage terminates charging.
As far as the cell voltages go, have you checked them agains a dvm to see if they're accurate? These cheap chargers do not have the precise voltage measurement that a $200 charger does, so the manufacturers 'calibrate' them to get close, but from the low side so the cells are not getting overcharged. Second, if this charge terminated on a 5000mah default capacity setting, the voltage shouldn't be 4.2 since charge was terminated by a capacity setting. I agree with the other posted that suggested putting it back on charge and see how much more it would take. As close as the voltage was, I'd guess it would only charge another few hundred mah before it'd terminate on voltage.
I'd just bump the default capacity setting up and let it terminate properly on voltage like they're supposed to.
#8
Somewhere in your chargers menu, there should be a place to set capacity. It is prob set to 5000mah. I think thats what the blinking was telling you - the charge was being terminated by the capacity setting and not by voltage which is what the other blinking msg is telling you - charge terminated based on voltage. Find the setting (may be in setup) and charge it to something higher like 6000mah.n
Some lipo cells are underrated and will charge to higher than the labeled mah. There's nothing wrong with that. I'd set the capacity default higher and see just how much the batt does take before the voltage terminates charging.
As far as the cell voltages go, have you checked them agains a dvm to see if they're accurate? These cheap chargers do not have the precise voltage measurement that a $200 charger does, so the manufacturers 'calibrate' them to get close, but from the low side so the cells are not getting overcharged. Second, if this charge terminated on a 5000mah default capacity setting, the voltage shouldn't be 4.2 since charge was terminated by a capacity setting. I agree with the other posted that suggested putting it back on charge and see how much more it would take. As close as the voltage was, I'd guess it would only charge another few hundred mah before it'd terminate on voltage.
I'd just bump the default capacity setting up and let it terminate properly on voltage like they're supposed to.
Some lipo cells are underrated and will charge to higher than the labeled mah. There's nothing wrong with that. I'd set the capacity default higher and see just how much the batt does take before the voltage terminates charging.
As far as the cell voltages go, have you checked them agains a dvm to see if they're accurate? These cheap chargers do not have the precise voltage measurement that a $200 charger does, so the manufacturers 'calibrate' them to get close, but from the low side so the cells are not getting overcharged. Second, if this charge terminated on a 5000mah default capacity setting, the voltage shouldn't be 4.2 since charge was terminated by a capacity setting. I agree with the other posted that suggested putting it back on charge and see how much more it would take. As close as the voltage was, I'd guess it would only charge another few hundred mah before it'd terminate on voltage.
I'd just bump the default capacity setting up and let it terminate properly on voltage like they're supposed to.




