XIAO ESP32 C3 does not work with external 3.7v battery?

Products & Technology XIAO
#1

Good day.
I have had good success with the Xiao sense.
I am trying with the ESP32 C3 as it is much cheaper, has a reset button and a solid antenna.

Now I am having a real issue : while connected on my PC USB, BT from the ESP32 C3 works perfectly fine, but it does not work any longer when connected to a typical 3.7 CR123 battery, when either connecter to the back side Vin, or the rail ?

Never had that issue with the Sense.

Does anyone know if there is an issue with the ESP32C3 and any external battery ? Does it need higher amps than the typical CR123 ?

*There is no serial.begin in the code.

Thanks

Philippe

#2

According to the recommended operating voltage in the datasheet,
nRF52840 : 1.75V or higher
ESP32C3 : 3.0V or higher

On the other hand, the nominal voltage of CR123 is 3.0 V. Since the 3.3 V voltage regulator inside XIAO has a voltage drop, the voltage may be lower than 3.0 V.

#3

Thx. Well it does not.
A basic external LED ino code works perfectly when connected to USB, and does not work any longer with external battery.

I have tried that on two separate XIAO ESP32 C3.

#4

What is the battery terminal voltage when the battery is connected to the BAT pad on the back of the XIAO?

#5

Where would you like me to measure that battery terminal voltage from please ?
Thank you.

#6

I would like to know what voltage is across the battery terminals with the battery connected to the BAT pad on the back of the XIAO and no USB.

#7

I had a similar issue and found no fix so far.

See Xiao ESP32-C3 and Xiao Grove shield compatiblity? - #5 by reivilo

1 Like
#8

I’m excited to share my positive experience with the Xiao Sense, which has worked flawlessly for me. However, I’m currently facing a challenging issue with the ESP32 C3. Although the ESP32 C3 performs perfectly fine when connected to my PC’s USB, I encounter difficulties when using it with a typical 3.7V CR123 battery. Whether connected to the backside Vin or the rail, the Bluetooth functionality stops working once powered by the battery.

#9

a typical 3.7V CR123 battery

In general, the nominal voltage of CR123 is 3.0V, too low voltage to run ESP32C3.

#10

I also have a issue with battery. So how can I solve it?

#11

I also have a issue with battery.

What is the problem specifically?

See the Battery Usege section of the wiki below and try using a 3.7V lithium battery.

#12

Ok I will see this section.