IMAX B6AC calibration issues
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Manos Pappas
Apr 17, 2016, 5:26:17 PM4/17/16
to cheali-charger
Hi,
I am using this charger (http://www.banggood.com/IMAX-B6AC-upgraded-B6AC-80W-multi-functional-smart-balance-charger-p-71972.html) for about 8 months charging my 1S-3S LiPo's without issues.
The only thing missing from this is the battery internal resistance (IR) function, which I need in order to check the quality of my batteries.
Looking for a firmware update for it, I came across this firmware and was amazed for what it offered.
After reading the available documentation, I've managed to flash v1.99 on it (it is an ATMega32 MCU with the original pin layout for the flash pins) but I am having issues with calibration.
I can calibrate voltage with my multimeter but it does not have (the multimeter) the capability for displaying three digits (it can display two digits on the 10A range and one in the 200mAh range), therefor I cannot be sure for the exact measurement.
Naturally, I cannot check the battery capacity (I used a 1S 150mAh LiPo for testing) since it reports a "calibration I current" error 4.
I used the cheali-charger-Dual-Power-B6AC-80W-RC_1.99-20160411_atmega32.hex to flash it.
I have two questions:
1. Is it possible that someone who performed calibration on exactly the same charger to send me a dump of the EEPROM (I believe that calibration data is stored there) so that I can restore these on my charger using avrdude? It would be really great if there was some kind of "calibration database" as this would help newbies like me.
2. When connecting my multimeter in series with the battery and the charger (BAT+ > METER- > METER+ > B6AC- > B6AC+ > BAT-), when calibrating "I charge" I get negative readings on the multimeter and when I calibrate "I discharge" I get positive ones. Is this normal?
Right now I've restored the original firmware to the charger (together with it's EEPROM backup) and works like before but I would really like to use cheali for the internal resistance function.
Many thanks in advance.
I am using this charger (http://www.banggood.com/IMAX-B6AC-upgraded-B6AC-80W-multi-functional-smart-balance-charger-p-71972.html) for about 8 months charging my 1S-3S LiPo's without issues.
The only thing missing from this is the battery internal resistance (IR) function, which I need in order to check the quality of my batteries.
Looking for a firmware update for it, I came across this firmware and was amazed for what it offered.
After reading the available documentation, I've managed to flash v1.99 on it (it is an ATMega32 MCU with the original pin layout for the flash pins) but I am having issues with calibration.
I can calibrate voltage with my multimeter but it does not have (the multimeter) the capability for displaying three digits (it can display two digits on the 10A range and one in the 200mAh range), therefor I cannot be sure for the exact measurement.
Naturally, I cannot check the battery capacity (I used a 1S 150mAh LiPo for testing) since it reports a "calibration I current" error 4.
I used the cheali-charger-Dual-Power-B6AC-80W-RC_1.99-20160411_atmega32.hex to flash it.
I have two questions:
1. Is it possible that someone who performed calibration on exactly the same charger to send me a dump of the EEPROM (I believe that calibration data is stored there) so that I can restore these on my charger using avrdude? It would be really great if there was some kind of "calibration database" as this would help newbies like me.
2. When connecting my multimeter in series with the battery and the charger (BAT+ > METER- > METER+ > B6AC- > B6AC+ > BAT-), when calibrating "I charge" I get negative readings on the multimeter and when I calibrate "I discharge" I get positive ones. Is this normal?
Right now I've restored the original firmware to the charger (together with it's EEPROM backup) and works like before but I would really like to use cheali for the internal resistance function.
Many thanks in advance.
alex alex
Apr 18, 2016, 3:15:22 AM4/18/16
to cheali-charger
Hi,
Are you sure the BAT+ > METER- > METER+ > B6AC- > B6AC+ > BAT- is correct? I would connect it like so BAT+ > METER- > METER+ > B6AC+ > B6AC- > BAT-.
I also think that it doesn't matter the sign on the multimeter readings as soon as you connected the BAT+ to B6AC+ and BAT- to B6AC-. But if you need reverse readings just interchange positive test lead with negative one.( this should show positive values on charge BAT+ > METER- > METER+ > B6AC+ > B6AC- > BAT-, and this should show negative readings on charge BAT+ > METER+ > METER- > B6AC+ > B6AC- > BAT-.)
I don't think current calibration has to be very accurate. The most important is voltage calibration. It doesn't really matters whether the charging current is 1A or 1.1A. It also doesn't really matter whether the charger shows 2200mAh or 2250mAh.
Regards,
Manos Pappas
Apr 18, 2016, 4:02:16 PM4/18/16
to cheali-charger
Hi alex,
Thanks for the answers.
One last question: are there any serious issues with v1.99 regarding charging 1S-4S batteries?
Thanks for the answers.
One last question: are there any serious issues with v1.99 regarding charging 1S-4S batteries?
alex alex
Apr 19, 2016, 1:00:33 AM4/19/16
to cheali-charger
As far as I know, no. All works great. There might be some issues with some chargers as there are many variations out there.
Regards.
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