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Old Jan 16, 2013, 03:43 AM
fried onion is offline
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Dynamite Passport Ultra Hidden Menu


Hi,
I have a charger with 1 cell's voltmeter off by 20mv and while looking for a solution I thought it might have a calibration menu like the icharger. I held down the mode and start buttons while powering up the charger and it came up with "input pass word" and 4 0's which you can change with the wheel. Now they've got me interested in what is in that menu I guess this is all pretty useless unless someone finds the password (its not 0000)
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Old Jan 16, 2013, 04:41 AM
Elios000 is online now
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brute force it only 4 digits shouldnt take to long
Old Jan 16, 2013, 05:21 AM
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true ill post back in a bit after I find it
Old Jan 16, 2013, 05:27 AM
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I have had way too long of a holiday... just remembered that there are 9^4 possibilities so unless some people want to divy up the numbers I can't do that many passcodes
Old Jan 16, 2013, 10:18 AM
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First are you sure that the volt meter you are using to determine it is off by 20mv is calibrated then your charger?
Old Jan 16, 2013, 03:05 PM
turko is offline
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passport charger


I recently bought the passport ultrasport charger and while balance charging my 3 cell lipos,it beeps that battery is full(4.2v) per cell but before I can even unplug the battery the voltages drop to 4.18-4.17.Its not good for a brand new charger and I would love to be able to re calibrate it.Check yoursout.After charger beeps,dont stop the charge just turn the dial to the voltage screen and you can see the volts dropping.I'm going to have to send it in to Horizon Hobby for warrenty repair, if I;m not able to fix the problem.If after I disconnect the battery and through it onto my el cheapo eflite 3115 plastic pos charger,it finishes charging to 4.2 Well, the code is not 1234.
Last edited by turko; Jan 16, 2013 at 03:18 PM.
Old Jan 16, 2013, 04:53 PM
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Quote:
Originally Posted by grimbeaver View Post
First are you sure that the volt meter you are using to determine it is off by 20mv is calibrated then your charger?
The voltmeter itself is probably not very accurate, however over 5 different lipo packs and multiple charges, it has consistently showed a 0.02v higher reading on the voltmeter. The charger also constantly needs to balance out the other 2 cells, with the 2nd cell being low across all of my batteries (making balance charging so very slow ). My dad brought some highly accurate power supplies home when his work was throwing them out, I'll have a look at them and see if they are accurate enough to test my charger.

Am I over reacting to this, I just got some new batteries and want to treat them properly.

the code is also not 1111, 1000, 1100, 1110 only 6556 possibilities left (we'll do this in no time)

Do you think its worth a try asking Horizon?
Last edited by fried onion; Jan 16, 2013 at 05:00 PM.
Old Jan 19, 2013, 10:10 AM
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Another question for Horizon


I also have this charger and have noted the same characteristics. I picked it up used for a good price and it gets the job done, so I am OK with it. One important thing to know about it is that the lipo discharge setting takes your cells down to 3.0v per cell and this setting is not user adjustable. It would be great if the password gave you access to this setting.
Old Jan 20, 2013, 10:49 PM
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I think the only way we will ever discover what functions are hidden is through numbers

we need to either get enough people to make brute forcing viable (if we got a bit more than 200 people to do 30 combos we would find it) but that probably won't happen so what we need to do is get enough people to petition horizon for it.

Or some super smart guy can reverse engineer the software on the mcu
Old Mar 16, 2013, 04:06 PM
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Heads up. Ya gotta count the "0", it's 10^4, 10000 possibilities.
In other words, 0000 -> 9999
Just sayin.
Old Oct 21, 2015, 01:04 AM
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Im having the same problem only my charger is out by 0.2v on cell number one. Emailed horizon on this issue and requested the password so ill post it here if they get back to me with it.
Old Oct 22, 2015, 12:02 PM
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Quote:
Originally Posted by fried onion View Post
Hi,
I have a charger with 1 cell's voltmeter off by 20mv and while looking for a solution I thought it might have a calibration menu like the icharger. I held down the mode and start buttons while powering up the charger and it came up with "input pass word" and 4 0's which you can change with the wheel. Now they've got me interested in what is in that menu I guess this is all pretty useless unless someone finds the password (its not 0000)
Just a guess but I expect the pass code is for the use of beta testers. Possibly so that they can make adjustments or allow them to report data back to the manufacturer.

Glen
Old Nov 18, 2015, 02:37 PM
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Quote:
Originally Posted by turko View Post
I recently bought the passport ultrasport charger and while balance charging my 3 cell lipos,it beeps that battery is full(4.2v) per cell but before I can even unplug the battery the voltages drop to 4.18-4.17.Its not good for a brand new charger and I would love to be able to re calibrate it.Check yoursout.After charger beeps,dont stop the charge just turn the dial to the voltage screen and you can see the volts dropping.I'm going to have to send it in to Horizon Hobby for warrenty repair, if I;m not able to fix the problem.If after I disconnect the battery and through it onto my el cheapo eflite 3115 plastic pos charger,it finishes charging to 4.2 Well, the code is not 1234.
While this is an old post, it bares some added information.
To charge a battery, it's necessary to have current flow. In order for this to happen, the charge voltage needs to be greater than the battery voltage would be by itself. We all sort of agree that a fully charged Lipo is about 4.20v per cell. This means that the charger must actually apply slightly more that 4.20v to charge the battery.
As the charge starts, it's usually current limited, based upon the battery characteristics (Capacity), or the charger's maximum current capability at the charging voltage. As the charge progresses, and the battery voltage increases, eventually the current decreases to hold the charge voltage to 4.20v + the necessary additional to allow charge current to flow.

How the charge terminates can differ. One method looks at the battery capacity, and sets a low charge rate limit. If the battery voltage is at 4.20v, and the current is below a calculated value,
Charging is terminated.
Another similar method also looks at the battery cell voltages during a short pause in charging current flow. Some of the Bantam chargers and clones used this method.

A "high resistance" battery may drop more between the while charging voltage limit, and the at rest voltage. There can easily be about a .03 volt difference, even with a good battery.

Measurement accuracy can also be a contributing factor when dealing with Lipos and the typical DMM. That is another lengthy subject. When you consider that the common inexpensive "pocket"
DMM has a 3 1/2 digit display, and about a 1% of full scale accuracy rating, it also has a +/- one least significant digit spec that gets added. So, an actual 4.20 cell voltage might read something less or more. Most of these meters measure 4.2 v on a 0-10v range, so 1% is actually .1v If you were to add the +/- uncertainty, this might increase to .11. Begin to see the problem?

I ended up having to get a high accuracy 6-1/2 digit bench DMM to resolve differences between various chargers, checkers, and readings.
Last edited by chuck75; Nov 20, 2015 at 01:18 PM.


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