Comments (14)
"Shouldn't it be charging at least at 1C?"
Yes, it should.
let us consider only "storage" (it's much simpler then "storage+balance")
so, I need more info:
- how many cells has the battery?
- what was the voltage on each cell at the beginning of the "storage" program?
- what was the current at the beginning of the the "storage" program?
from cheali-charger.
I'll collect and share some more precise details.
But just for a start I had this happening with 3S and 4S, I usually drop my cells up to 3.7v so that should have been the initial cell charge.
from cheali-charger.
Test with a 1300mah 3S LiPo.
Details:
- 3 cells
- 3.69v
- 197mA
from cheali-charger.
can you give me the voltage for all cells (separately) and also the measured resistance for all cells?
I'm assuming the current didn't increased after a while?
from cheali-charger.
I stopped the program but I restarted it again. See the values bellow:
Cell voltage:
- 3.70v
- 3.71v
- 3.70v
Batt resistance: 99mΩ
Current: 197mA
from cheali-charger.
interesting,
what is the resistance on each cell separately?
and you are running "storage"?
what cheali-charger version are you using?
from cheali-charger.
The fw version is 0.32m.
Individual cell resistance is:
- 35mΩ
- 21mΩ
- 42mΩ
I left it running until now and it changed from 52% to 57% in 30min. If it was to raise to 66% when it stops it would be almost 2hrs waiting.
from cheali-charger.
please install the "not_tested/cheali-charger-[?]-0.33.hex" version.
The "%" value is not important.
How the "storage" program should work, the charger should:
- charge at 0.1C for a moment
- jump to 1C until one of the cells voltage reaches 3.850V
- go down from 1C to 0.1C so that the voltage remains at 3.850V
- stop charging
If the 0.33 version is not working as above,
I will need from You a short video (about 3min long) of the "storage" program running,
for now it's difficult for me to judge what is going on there.
from cheali-charger.
unfortunately you will need to calibrate the charger again after installing the 0.33 version
from cheali-charger.
All done, 0.33 loaded and calibrated.
Tried again with the same LiPo and same happens, check the video bellow.
https://www.youtube.com/watch?v=3TVlw_WvViA
Just 1:30 but even after 20min it was still only charging at 212mah.
from cheali-charger.
Thanks for the video,
hm... I have no idea why this is so, the current should jump to 1C,
I will do some test today, maybe I will find something.
And the charge process is working normally at 1C?
from cheali-charger.
Yes. The charge process works fine.
Minor issue there as it leaves the cells a bit bellow 4.20v but I usually
compensate in the calibration area and it gets perfect.
from cheali-charger.
Indeed, there was a bug in the firmware,
I've uploaded a new version to "not_tested/cheali-charger-[?]-0.33.hex"
please check if it works now.
Best regards,
Paweł
ps. "Minor issue there as it leaves the cells a bit bellow 4.20v"
This may be addressed in the next version
from cheali-charger.
Seems like you nailed it.
The LiPo as almost at storage level but I could clearly see the charge raise to 1C and then lower down but always to much higher values than before. I'll test it better tomorrow if I get some discharged LiPo's.
Great work, thanks!
from cheali-charger.
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