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OESF Portables Forum _ Gemini PDA - Hardware _ Charging the Gemini with a non-Gemini cable ?

Posted by: Dixit Sep 2 2018, 05:08 AM

Hello,

So I read around the Net that the Gemini charges itself through a dedicated fast-charge protocol. Indeed, mine does: 2 hours and it is full (and hot).

Could someone elaborate on where this magic is physically located ?

My car has a USB port marked "Charge Only" so clearly not a dataport.
I have a charging cable (bought at HEMA).
The Gemini charges, but only 15% during a 2 hour ride.

What slows this down ? The car connection ? The USB-A-to-C cable ? Or both ?

(A pity though... this charger from HEMA is actually a bunch of connectors, being USB A, C, the one for the iPad and two others. Quite nice to have a one-size-fits-all cable).

Posted by: KF6GPE Sep 2 2018, 10:47 AM

I'm guessing that your car USB port is a low-current charging port. The cable shouldn't be the issue.

Posted by: DJO Sep 3 2018, 08:48 AM

QUOTE(Dixit @ Sep 2 2018, 02:08 PM) *
So I read around the Net that the Gemini charges itself through a dedicated fast-charge protocol. Indeed, mine does: 2 hours and it is full (and hot).
...
What slows this down ? The car connection ? The USB-A-to-C cable ? Or both ?


The special sauce is the fast-charger uses the data lines in the USB for power so it can shove more juice down the same cable, it also carries a higher voltage to get more current across. Look at the charger:
5V @ 2A
7V @ 1.67A
9V @ 1.67A
12V @ 1.25A

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