Hi there, GPStar dev here.
You are correct that you do not want the charging power backfeeding into the GPStar electronics. You may also be aware that on the Talentcell, due to how they laid out their battery circuitry, the battery must actually be on in order for the charger to work properly. So it is critically important that you have a way to disconnect the GPStar electronics from the battery during the charging process.
The way almost everyone I know does this is by adding another switch. If your GPStar kit is set up so that the pack is powered off of the GPStar Amplifier (that is, the only connection to the Talentcell is the 12V barrel jack) then this is pretty straightforward. If you are also using the USB connector (which we no longer recommend, to be fair) then it is only slightly trickier.
Here is a diagram I threw together for someone a while back, back when the USB was still being used:
![Image]()
In this photo, "INT" refers to the internal connection to the Talentcell. "EXT" is your charging port. "GP★" is the GPStar electronics. All connections are the positive side; the GND for everything should be tied together and not switched at all.
In the case of only using 12V, then you would just ignore the "5V" connections and could even use an SPDT on-on switch in place of the pictured DPDT on-on switch.
Happy to help. Also if you have a Facebook account and have not yet joined the Facebook group for GPStar, highly recommended.
You are correct that you do not want the charging power backfeeding into the GPStar electronics. You may also be aware that on the Talentcell, due to how they laid out their battery circuitry, the battery must actually be on in order for the charger to work properly. So it is critically important that you have a way to disconnect the GPStar electronics from the battery during the charging process.
The way almost everyone I know does this is by adding another switch. If your GPStar kit is set up so that the pack is powered off of the GPStar Amplifier (that is, the only connection to the Talentcell is the 12V barrel jack) then this is pretty straightforward. If you are also using the USB connector (which we no longer recommend, to be fair) then it is only slightly trickier.
Here is a diagram I threw together for someone a while back, back when the USB was still being used:
In this photo, "INT" refers to the internal connection to the Talentcell. "EXT" is your charging port. "GP★" is the GPStar electronics. All connections are the positive side; the GND for everything should be tied together and not switched at all.
In the case of only using 12V, then you would just ignore the "5V" connections and could even use an SPDT on-on switch in place of the pictured DPDT on-on switch.
Happy to help. Also if you have a Facebook account and have not yet joined the Facebook group for GPStar, highly recommended.
Statistics: Posted by Nomake Wan — November 15th, 2025, 12:12 pm