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Old Jun 21, 2015, 09:04 AM
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SKYRC iMAX B6 mini off by about 0.03 V

I have just received my SKYRC iMAX B6 mini couple of days ago and have determined that it measures the voltage with up to 0.03 V error. Should I consider sending my iMAX B6 mini back or is this something acceptable? I was thinking that if I were to send the B6 mini back I could order the ACCUCELL-6 50W 6A instead.

http://www.hobbyking.com/hobbyking/s...arehouse_.html

Is this worth the effort of all the time and shipping?
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Old Jun 21, 2015, 10:41 AM
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Quote:
Originally Posted by flyLuke View Post
I have just received my SKYRC iMAX B6 mini couple of days ago and have determined that it measures the voltage with up to 0.03 V error. Should I consider sending my iMAX B6 mini back or is this something acceptable? I was thinking that if I were to send the B6 mini back I could order the ACCUCELL-6 50W 6A instead.

http://www.hobbyking.com/hobbyking/s...arehouse_.html

Is this worth the effort of all the time and shipping?
First, how did you determine it is off by .03V?
Second, is the difference .03V on a single cell or for the pack?

If the difference is .03V per cell then the percentage of error is only .7%.
Less than if the difference is .03V per pack.

You didn't specify the battery so the above is just a guess. If you don't want guesses, please fully specify all the components involved in the question.

Glen
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Old Jun 21, 2015, 10:52 AM
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Originally Posted by ggcrandall1 View Post
First, how did you determine it is off by .03V?
Second, is the difference .03V on a single cell or for the pack?

If the difference is .03V per cell then the percentage of error is only .7%.
Less than if the difference is .03V per pack.

You didn't specify the battery so the above is just a guess. If you don't want guesses, please fully specify all the components involved in the question.

Glen
I compared voltage measured by the B6 mini to several high quality volt meters from the microwave lab that I work at. I am pretty sure that it is off by up to 0.03 V. As for the batteries used I only have 1 cell batteries for now as I am just getting into RC and the B6 mini is my first charger so I am not sure how big error is acceptable. I wanted to start with the B6 mini and later once I get more into the hobby use it as a car charger and buy something such as the Turnigy Reaktor 300W for home use. However, in order to do that later I must know that the B6 mini is acceptable.

The batteries I charge for now are:

http://www.gearbest.com/rc-quadcopte...pp_187235.html

http://www.gearbest.com/rc-model-acc...pp_122091.html

http://www.amazon.com/gp/product/B00...ilpage_o03_s00
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Old Jun 21, 2015, 11:13 AM
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Originally Posted by flyLuke View Post
I compared voltage measured by the B6 mini to several high quality volt meters from the microwave lab that I work at. I am pretty sure that it is off by up to 0.03 V. As for the batteries used I only have 1 cell batteries for now as I am just getting into RC and the B6 mini is my first charger so I am not sure how big error is acceptable. I wanted to start with the B6 mini and later once I get more into the hobby use it as a car charger and buy something such as the Turnigy Reaktor 300W for home use. However, in order to do that later I must know that the B6 mini is acceptable.

The batteries I charge for now are:

http://www.gearbest.com/rc-quadcopte...pp_187235.html

http://www.gearbest.com/rc-model-acc...pp_122091.html

http://www.amazon.com/gp/product/B00...ilpage_o03_s00
Well the accuracy is better than 1% and I don't think you are going to find hobby equipment significantly better than that.

As to a future charger, what will your charging requirements be? Determine the largest battery you will be charging. As most chargers are rated by watts figure the watts required for a 1C charge for your largest battery. Then figure how many batteries you want to charge at the same time. Multiply the result by the C rate you want to charge.

Do you have a link to the B6 mini?

I am partial to the FMA (Revolectrix) chargers.
http://www.usastore.revolectrix.com/...pro-Chargers_2

May I also suggest you read this: http://www.tjinguytech.com/charging-how-tos

Glen
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Old Jun 21, 2015, 12:27 PM
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Originally Posted by ggcrandall1 View Post
Well the accuracy is better than 1% and I don't think you are going to find hobby equipment significantly better than that.

As to a future charger, what will your charging requirements be? Determine the largest battery you will be charging. As most chargers are rated by watts figure the watts required for a 1C charge for your largest battery. Then figure how many batteries you want to charge at the same time. Multiply the result by the C rate you want to charge.

Do you have a link to the B6 mini?

I am partial to the FMA (Revolectrix) chargers.
http://www.usastore.revolectrix.com/...pro-Chargers_2

May I also suggest you read this: http://www.tjinguytech.com/charging-how-tos

Glen
I don't think that I will ever go higher than 2000-3000mAh. I was hoping I could later use the B6 mini to charge like one 2200mAh battery for lets say 450 heli via a car cigarette lighter plug but at home would like to eventually get something that can charge 3 of those batteries at a time.

Here is the link to the one I got:

http://www.amazon.com/gp/product/B00...ilpage_o01_s00
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Old Jun 21, 2015, 12:37 PM
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May be Voltage Calibration can help.

How to Calibrate IMAX B6 to correct voltage (5 min 35 sec)
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Old Jun 21, 2015, 12:45 PM
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Originally Posted by Sam19600 View Post
May be Voltage Calibration can help.

https://www.youtube.com/watch?v=scC3WIXWjv4
I have tried to do the calibration but apparently the B6 mini does not have that feature. Maybe the new firmware update (ver. 1.2) will allow it but can't find it anywhere, even though the SKYRC claims that it is released.
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Old Jun 22, 2015, 01:52 AM
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You need to download and install "ChargeMaster" on your PC, from http://www.skyrc.com/index.php?route...product_id=200 before update firmware

To update firmware
- Connect IMAX B6 Mini to your PC
- On you PC, run ChargeMaster -> Systern -> Update Firmware

Imax B6 SKYRC Firmware Update - обновление прошивки IMax B6 mini (2 min 44 sec)
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Old Jun 22, 2015, 03:53 PM
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Originally Posted by Sam19600 View Post
You need to download and install "ChargeMaster" on your PC, from http://www.skyrc.com/index.php?route...product_id=200 before update firmware

To update firmware
- Connect IMAX B6 Mini to your PC
- On you PC, run ChargeMaster -> Systern -> Update Firmware

https://www.youtube.com/watch?v=5b_QsSu_-Hk
I have tried this but the update wouldn't show in my ChargeMaster.

The only difference is that I have downloaded the ChargeMaster from this RCgroups topic:

http://www.rcgroups.com/forums/showthread.php?t=2391578

Sam19600 were you able to update your B6 mini via ChargeMaster? Where did you get the software from?
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Old Jun 23, 2015, 05:10 AM
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FW v 1.12 is not available till later in the year according to SkyRC.... but has been installed on other chargers such as Accucel ECO6 .... I have standard B6's, B6 mini and the ECO6 ......

I too own a lab .... and also checked my chargers but ALL work within the specs listed. As gcr said - they are hobby gear .....

The mini cannot be user calibrated. Unless you replace the FW with 3rd party software as listed in another thread. But this applies to most chargers in this line .... regardless of label.

Nigel
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Old Jun 23, 2015, 10:13 AM
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Originally Posted by solentlife View Post
FW v 1.12 is not available till later in the year according to SkyRC.... but has been installed on other chargers such as Accucel ECO6 .... I have standard B6's, B6 mini and the ECO6 ......

I too own a lab .... and also checked my chargers but ALL work within the specs listed. As gcr said - they are hobby gear .....

The mini cannot be user calibrated. Unless you replace the FW with 3rd party software as listed in another thread. But this applies to most chargers in this line .... regardless of label.

Nigel
Nigel would you return the B6 mini if you were me? I ordered it from Amazon with the Prime option and if I am not mistaken I can return the B6 mini for a full refund.
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Old Jun 23, 2015, 10:27 AM
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Nigel would you return the B6 mini if you were me? I ordered it from Amazon with the Prime option and if I am not mistaken I can return the B6 mini for a full refund.
Why ? It works does it not ?

My B6 mini blew its 'bridge' 5v to controller and I contacted seller to get a replacement. Refund I was not interested in.

I am waiting replacement.

I have posted before about reliance on displayed numbers ... decimal rounding and maths usually explains the small apparently incorrect figures.

I have two standard B6 chargers (50W), one B6 mini (60W) and an ECO6 (80W) chargers on my bench ... I love them ... no need to change. The Mini still works as long as I have PC and 12V power connected ... the replacement is on way ... and then I will have two mini's ..............

If you have refund option ... then I will not say don't use it ... but for me ... I think you see my pov

Nigel
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Old Jun 23, 2015, 11:28 AM
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Why ? It works does it not ?

My B6 mini blew its 'bridge' 5v to controller and I contacted seller to get a replacement. Refund I was not interested in.

I am waiting replacement.

I have posted before about reliance on displayed numbers ... decimal rounding and maths usually explains the small apparently incorrect figures.

I have two standard B6 chargers (50W), one B6 mini (60W) and an ECO6 (80W) chargers on my bench ... I love them ... no need to change. The Mini still works as long as I have PC and 12V power connected ... the replacement is on way ... and then I will have two mini's ..............

If you have refund option ... then I will not say don't use it ... but for me ... I think you see my pov

Nigel
The entire point of me ordering a charger was to stop using a separate volt meter when charging to full capacity or to storage voltage. Right now my B6 mini when I request a storage voltage which should be 3.85 V it gives me almost 3.9 V. Since I am new to RC I am not sure is that acceptable or not. I have 10 years experience in electrical and microwave engineering. I can make my own charger and make sure the batteries are taken care off properly but the whole point of ordering the charger was for it to make my life simpler. I just want to fly my RC models once in a while (so called Sunday flyer). I am not very knowledgeable about LiPo batteries so I don't know whether or not I can use my B6 mini as is without double checking it every time.
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Old Jun 23, 2015, 11:42 AM
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Quote:
Originally Posted by flyLuke View Post
I compared voltage measured by the B6 mini to several high quality volt meters from the microwave lab that I work at.
What specific procedure did you use to determine the apparent error? e.g. - Was the charger in 'monitor' mode when the voltage of the battery was measured, or was this measurement taken during a charge cycle?

In order to make a correct assessment of the accuracy of your charger, the charger must be in 'BATT METER' mode (not charge mode) and you'll need to compare this voltage to that of a meter of known accuracy.

If I had a charger that is out by 30mV per cell after verifying via correct procedures, I would either recalibrate it if possible or seek replacement.

Mark
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Old Jun 24, 2015, 02:49 PM
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Sorry Flyluke for late reply. I had downloaded and installed ChargeMaster, but I could not find the firmware 1.12 either. Sorry I hadnít check before posting. I donít have the mini yet just B6AC. May be it will come out late this year as Nigel said.

By updating software V1.12, we will charge 2S or above LiPo batteries without the balance charge cable connected when not using the Balance charge mode. This new release may not have calibration function added.

To check battery voltage I agreed with Mark to use Battery Monitor not from charging screen.

From my experience with IMAX B6AC, voltage shown on charging screen is over stage. If you charge with 0.9A rate, you will get about 0.10-0.15 Volt higher than charging with 0.1A rate (my battery is 1S 900mAh, charge from 3.8V). This over stage display on charging mode may be the cause you get 0.03V off from actual voltage. My solution is charging in 2 rounds, first round is with 0.9A rate until it cut off and second round charging again with 0.2A rate. This way I will get nearest 4.20 volt.
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