GTA02 Battery Capacity (Was: Re: More about the GTA02)

Michael Shiloh michael at
Thu Feb 28 17:21:48 CET 2008

Andre Lanvermann wrote:
> Oooh, the it seems i missunderstood the previous Messages. I was sure 
> that there is NO Charger
> for the NEO Except the USB Port of a Computer. Im sorry :(
> Greetings
> Andre

Hi Andre, and welcome to the project.

You have to distinguish between the two models of Neo.

There was no charger for the Neo 1973.

There will be a charger for the Neo Freerunner, which has the secret 
resistor jOERG mentions below.


> joerg schrieb:
>> Am Do  28. Februar 2008 schrieb Andre Lanvermann:
>>> I read the Archives and found this Topic. I own a T-Mobile MDA Vario. 
>>> The device is
>>> charged via USB too. And theay included an USB Wallcharger. Have 
>>> anybody allready checked
>>> this charger?
>>> Device Data:
>>> Delta Electronics inc.
>>> AC Adapter HTC P/N: 79H00051-02M
>>> Model: ADP-5FH C
>>> Input: 100-240V~ 0,2A 50-60hz
>>> Output: 5V = 1A LPS
>>> Frequency Level 4
>> What i've learned so far:
>> The strange thing with USB-charger is a resistor of certain Ohms (47k 
>> IIRC) that's supposed to connect 2 pins of the charger's plug "to 
>> identify OM-charger".
>> I can't say whether this is standard for USB-chargers, or what will 
>> happen when NEO doesn't sense this resistor on USB-power detection.
>> Charging seems to be controlled by the main CPU via PCU-chip. If 
>> there's no CPU control e.g. due to completely flat accu, only a very 
>> low secure trickle charge takes place (->"if you can't power on your 
>> NEO, connect to USB and try again after ~30 min..."). There are 
>> chances this will be the same for missing resistor, depending on what 
>> logic is in the "driver".
>> Maybe one of the devs may shed some more light on this.
>> jOERG
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