P3P remote with replaced battery - low voltage

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Hi, does anyone have experience with replacing GL300 controller battery with generic 2S1P battery ?

I tried several batteries, but I only get low voltage warning and one led blinking with fully charged battery.

It sucsesfully connect to P3P drone, it works correctly, but constantly beeps.

Voltage is the same as original battery, both red and black wires are simply soldered to TX60 connector.
 
Hi, does anyone have experience with replacing GL300 controller battery with generic 2S1P battery ?

I tried several batteries, but I only get low voltage warning and one led blinking with fully charged battery.

It sucsesfully connect to P3P drone, it works correctly, but constantly beeps.

Voltage is the same as original battery, both red and black wires are simply soldered to TX60 connector.
Do the two videos in this post help?

Replacement battery for P3A controller?
 
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So, ordinary 2S1P battery is not enough for this controller.

It is greedy and wants more than 8.3 V to detect full charge.
 
So, there is domething wrong with controller.

8.5V from stabilized power supply and still low voltage warning.

Question is, what is wrong.

Controller is working, except it does not want to flash firmware from USB stick as battery is not at 50%.
 

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