Ending Storage Charge/Charge Completion Percentage Value

[RustyUs]

When charger is done with storage charge (3.8v/cell) it's always showing 66%. What is the 66% representing?

But then on my H6 Pro, the ending % on a storage charge is always around 42%...

I thought possibly somebody had a simple explanation for the difference on two different chargers from same brand.

 

[WickedFog]

When charger is done with storage charge (3.8v/cell) it's always showing 66%. What is the 66% representing?
View attachment 199344

But then on my H6 Pro, the ending % on a storage charge is always around 42%...
View attachment 199345
I thought possibly somebody had a simple explanation for the difference on two different chargers from same brand.

I think that is just trying to calculate the mAh in the battery. You're getting different results because you are reading two different batteries. One is a 2s, and the other is a 4s. And I am betting the mAh are also different?

I never pay attention to that. I just watch the voltage and IR readings.

 

[RustyUs]

I think that is just trying to calculate the mAh in the battery. You're getting different results because you are reading two different batteries. One is a 2s, and the other is a 4s. And I am betting the mAh are also different?

I never pay attention to that. I just watch the voltage and IR readings.

I updated first photo. Same 4S battery on both chargers. Chargers are using the ending 3.8v/cell voltage to calculate the number.

I can plug any LiPo pack in (at 3.8v/cell storage voltage) and when using the D6, the pack will show starting out at 66% when charging. Same scenario, but using the H6 charger, the LiPo packs start out at 42% at the beginning of a charge.

I noticed it years ago, but just thought the H6 Pro, being a newer charger, used a different formula to come up with the %.

 

[WickedFog]

I updated first photo. Same 4S battery on both chargers.
I noticed it years ago, but just thought the H6 Pro, being a newer charger, used a different formula to come up with %.

Not really sure why it's reading differently then. Like I said, I never pay any attention to it to even know what it is doing.

Have you gone into the charger settings to see if anything is set different? How about firmware updates?

 

[DavidB1126]

Agreed with @WickedFog

Pretty sure it's a percentage of the mah. But if your at 3.8v/cell for storage charge you're fine

 

[RustyUs]

Agreed with @WickedFog

Pretty sure it's a percentage of the mah. But if your at 3.8v/cell for storage charge you're fine

I just wanted to get people's heads a thinkin' before I close the book on this in my own head.

Yeah, it's definitely a voltage thing. I can plug any capacity; any cell count, LiPo pack in (at 3.8v/cell storage voltage) and when using the D6, the charger will show 66% (completion percentage) when beginning a charge. Same scenario, but using the H6 charger, the LiPo packs start out at 42% (completion percentage) at the beginning of a charge.

It doesn't really bother me. I've waited almost five years of using Hota's D6 and H6 chargers in perfect harmony before bringing the differences up. I thought maybe somebody else out there was using Hota chargers with same completion percentage values when starting a charge on a LiPo pack.

Meh.

 

[Greywolf74]

I just wanted to get people's heads a thinkin' before I close the book on this in my own head.

Yeah, it's definitely a voltage thing. I can plug any capacity; any cell count, LiPo pack in (at 3.8v/cell storage voltage) and when using the D6, the charger will show 66% (completion percentage) when beginning a charge. Same scenario, but using the H6 charger, the LiPo packs start out at 42% (completion percentage) at the beginning of a charge.

It doesn't really bother me. I've waited almost five years of using Hota's D6 and H6 chargers in perfect harmony before bringing the differences up. I thought maybe somebody else out there was using Hota chargers with same completion percentage values when starting a charge on a LiPo pack.

Meh.

The % is just the estimated charge percentage like you and the others thought. The reason its different is just a difference in the firmware on the units. The D6 thinks that 3.8V/C is 66% charged and the H6 thinks the same level is 44% charged. It says the same for all batteries because thats just what is coded in to the firmware for those voltage levels.

 

[bill_delong]

Yup, the manual states that it's measuring the "completion percentage" which will likely be a variable based on the voltage before you started the action and the end voltage... I suspect you might get the same percentage if you started at the same voltage with 2 identical packs of same capacity. Switching between models of chargers will also likely calculate different % readings as well.

Only thing I would be interested in are the voltage readings and IR

https://bluerobotics.com/wp-content/uploads/2021/02/H6-Pro-Manual-English.pdf

 

[Jerold]

It is 66% of the operational voltage range of the battery.
Vmax = 4.2V
Vmin = 3.0V
Pch = 66%

Voltage = (Vmax-Vmin)*Pch+Vmin

(4.2V - 3.0V)*66% +3.0V = 3.792V

Or ~3.8V.

One could argue that it's 66% charged, which would also be true, because the charge is proportional to the voltage.

 

[RustyUs]

It is 66% of the operational voltage range of the battery.
Vmax = 4.2V
Vmin = 3.0V
Pch = 66%

Voltage = (Vmax-Vmin)*Pch+Vmin

(4.2V - 3.0V)*66% +3.0V = 3.792V

Or ~3.8V.

One could argue that it's 66% charged, which would also be true, because the charge is proportional to the voltage.

Yes, that explains everything... for the D6. The H6, being newer, just uses a different minimum voltage for a LiPo's operating range/threshold, I guess. I thought maybe I missed a LiPo battery seminar on what's "generally accepted" for batteries nowadays.

 

[Jerold]

Yes, that explains everything... for the D6. The H6, being newer, just uses a different minimum voltage for a LiPo's operating range/threshold, I guess. I thought maybe I missed a LiPo battery seminar on what's "generally accepted" for batteries nowadays.
View attachment 199637

3.0V/4.2V is the absolute min/max for a standard LiPo. I would not recommend running a LiPo down to 3.0V. Most people cut off around 3.4-3.6V. When you run the car there is voltage droop. Which means when you read 3.5V it's much less when you using the battery.

Realistically we use about 50% of the maximum charge.