Hello,
I’m using a Li-Po 3.7V 2000mAh 7.4Wh battery with my ESP32s3 sense module.
The charged battery works and runs the module when disconnected from USB.
When USB is plugged in the red LED stays on all the time and no charging is happening.
I can actually see a very slow declining of the voltage, when I have a simple sketch running that logs the measured voltage.
What am I missing? Any advice highly appreciated!
Thank you!
Hi there,
So, I think you misunderstood the WiKi “Battery Section”
, a LiPo battery is not a standalone lithium battery, but a type of lithium-ion battery
from the WiKi …
If you want to connect the battery for XIAO, we recommend you to purchase qualified rechargeable 3.7V lithium battery
Lithium battery vs. Li-Po, YMMV 
HTH
GL 
PJ 
FYI , charge current is 51ma.
To find the charging time (T) you can use the formula that relates capacity and current
T=C/I
𝑇=2000mAh @51mA
T≈39.22 hourscap T is approximately equal to 39.22 hours
𝑇≈39.22 hours
That’s a long time to charge… 
I would re-evaluate your plan go for some deep sleep on a smaller battery. What is the App?
Thank you for your answer!
Very aware of the slow charging… somehow I thought it’s 100mA. 
My sketch takes about 50mA, that explains the battery behavior.
Already ordered charger modules.
Thanks again!
I use the same battery as you do on a XIAO Esp32 S3 Sense and it charges at 100mA. I use the battery pads underside for the battery connection.
Hi there,
I see conflicting info , so the WiKi says 100ma. The Datasheet says 50ma. based on the r/c used.. Wouldn’t be the first time.
HTH
GL PJ
Thanks to @grobasoz I went and looked more. 
hmm… So I am probably doing something wrong.
I’ll go for the charger module for now.
Thank you for reply though!
Hi there,
Check those Battery PADs, double Eyeball them be sure no bridging or stray solder
Can you post a PIC ? and What code you are using, if not proprietary Use the code tags above “</>” Paste it in there.
We can look and test it.
HTH
GL PJ