Battery Medic Calibration

[adrian_sm]

Is it possible to recalibrate the Battery Medic?

Mine seems a far bit out. Cracking open the cover I can see two trim pots, but no idea what they do.

- Adrian

 

[adrian_sm]

Here are some pics of the guts.

Note two of the three holes in the board have a little trim pot below.
Second pic shows a close up of one of the pots.

 

[number1cruncher]

Adrian,

Did you have any luck with this? Did you try turning the pots?

 

[adrian_sm]

No haven't been bothered. I occasionally use it to check the charge state of a pack, but would never use it for balancing, as it is effectively unbalancing my batteries compared to what my chargers, and DMM say.

I thought someone else mentioned recalibration of them on here, but my searches have turned up nothing. So I think you may just be at the mercy of the tolerance of the balance resistors.

 

[Bazaki]

I have a few Battery medics that really needs to calibrate, I thought I balanced some packs, but after all this medic was imbalancing them, anyone more info about calibrating a Medic ?

 

[neptronix]

I have yet to hear about a battery medic that actually balanced batteries properly. I am left to believe that this is their inherent nature. Try the pots.

 

[Bazaki]

Well I have 5 of them and they all display different voltages ( but good enough ) and 1 of them shows 4,15 to 4,19 well the others and also my cell logs display nicely 4,16v per cell. so if you balance with this BM then you get them out of balance while they were balanced.

The 2 pot meters inside are for calibrating the total voltage, 1 pot for accurate adjustment and the other for normal adjustment.
Nothing for cell calibrating.

 

[drunkencat129]

im currently working on a way to calibrate the medic so far found out thay use resisters to calibrate but need to test thiss so far found theres 2 models of the medic one has big chip under the other has a black epoxy dot the dot one is crappy the chip type one is better from what if found more acurate also noticed there is diffrent resisters between them so there tuned the ones that read off have a bank of resisters under the disscharge bank on the lcd side of the board also nothing changes if u do the fast disscharge resister mod makes killer heat tho nice hand warmers lol got 2 amps disscharge so far wont go eney more because jst jacks getting warm lol so 1 amp is what i set mine to that work amazing just wish some one chould help me find a tweak to calibrate the voltage and to put after market lcd because the oem ones are crap lol

 

[parabellum]

I have yet to hear about a battery medic that actually balanced batteries properly. I am left to believe that this is their inherent nature. Try the pots.

Have 2 MKS Propo (earlier HK version came with battery medic inscription) from hobby king, very accurate reading if I do not balance or discharge. When it heats readings get apart from real but they get fine after less cells are participating in balancing. Best results were setting to 4.10V balance limit, so it does not discharge cell under 4.1V anymore and it gets them very close together, way more accurate as Icharger 3010b, eco eight or hk-010 all together. Maybe just lucky.

Calibrating it would be more complicated, energy and time consuming then buying few more of them and keeping better ones.
Have 12 of those cumming, wondering how good they are.
https://www.leaderhobby.com/product.asp?ID=9394001226065

 

[psycholist]

Parabellum
Looking at the Battery Medic specs, the balance limit is 2.0v to 3.9v. Is the 4.1v limit only possible with the older MKS Propo units?

 

[parabellum]

Parabellum
Looking at the Battery Medic specs, the balance limit is 2.0v to 3.9v. Is the 4.1v limit only possible with the older MKS Propo units?

Donono, have only MKS Propo.
Adjustable upper balance limit 4.20V
Adjustable upper discharge limit 4.00V

 

[psycholist]

Found listing for discontinued MKS unit. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6748
Specs are the same as the new Battery Medic. Hopefully, Battery Medic is just a rebadged MKS and will behave same as yours.

 

[parabellum]

Found listing for discontinued MKS unit. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6748
Specs are the same as the new Battery Medic. Hopefully, Battery Medic is just a rebadged MKS and will behave same as yours.

I think they switched this 2 specs anyway.

Balance voltage range: 2.0v ~ 3.9v
Discharge: 3.0v ~ 4.2v

real settings are:

Balance voltage range: 2.5v ~ 4.2v
Discharge: 2.0v ~ 4.0v

It makes no sense having balance voltage lower then discharging and discharging higher then balance.

Edit. They also got the price down, I believe it was about 19.xxU$ few weeks ago.

 

[psycholist]

Ahhh! Good observation parabellum! What u say makes sense.
Anyone know if the generic units sold by leaderhobby are as good quality and accuracy as the genuine HK Battery Medic?