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Is my Imax overcharging my 3S Lipo??
#11
It doesn't really matter how well charged (or overcharged) the battery is. Maybe SkyRC gives some clues about best practices for calibration. But basically it's just about adjusting the voltage measured by the charger against known good values, for example a trusted multimeter. An argument could be made that you should calibrate it at exactly 4.2V (or as close as possible) to prevent these overcharging situations in case the offset isn't exactly linear.

In any case I would discharge the battery slightly so that it isn't stored in its overcharged state.
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#12
Now, you seem to have a genuine B6AC, but it may be a bit off with the said cell of 60 mV.

As a vivid user of the B6AC i can say, that another possibility to solve your problem can be seen in the very first picture you sent, and in the first post in this thread, where you write:

Quote:So I balance charged the Lipo to 12.60v(4.2 per cell) with my Imax b6 ac v2


Use the Li Ion program, it will charge nominally to 4.10, possibly to about 4.15 in your case.

Such a unit basically is no measurement Instrument, but a charger.  When you check the currents, they are far more off than the voltages anyway, so dont worry.

I like the ongoing discussions about accuracy (in Voltage, Current, IR, ....), since people start to worry about what they do, and what they get from their equipment. But still - a charger is a charger, and not a measurement instrument.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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#13
A charger needs to be both because it can't charge reliably if its measurements are way off. And the B6 v2 is able to do much better than it does in this case so something must be wrong here.
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#14
(02-28-2019, 04:16 PM)DarkRaven Wrote: A charger needs to be both because it can't charge reliably if its measurements are way off. And the B6 v2 is able to do much better than it does in this case so something must be wrong here.
I cannot contradict because i by myself have given the first B6AC genuine back, its currents where so way off there was nothing to use it.
bournevexed likes this post
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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#15
Problem sorted!! I rigged up a 6s1p pack. Charged them up on the liitokala 1st then let them sit for a day in parallel then measured the voltage
& wrote the voltage of each cell down on paper Then created the 6 in series(spot welded). Added main pos & neg & then the balance wires(Soldered).
Hooked it up to the Imax b6 & then successfully calibrated the charger!
You can tell its its firing proper now!!  Big Grin Big Grin

Thanks for your input anyway guys! Cool
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#16
Awesome, I figured calibration was the culprit… Nice work.

There are instances where things can leave the factory with a less than ideal calibration so it’s always good to check.
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#17
(03-26-2019, 03:59 PM)bournevexed Wrote: Problem sorted!! I rigged up a 6s1p pack. Charged them up on the liitokala 1st then let them sit for a day in parallel then measured the voltage
& wrote the voltage of each cell down on paper Then created the 6 in series(spot welded). Added main pos & neg & then the balance wires(Soldered).
Hooked it up to the Imax b6 & then successfully calibrated the charger!
You can tell its its firing proper now!!  Big Grin Big Grin  

Thanks for your input anyway guys! Cool
Can you tell me how to get the imax (genuine) into calib mode ? Thanks.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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