Hello everyone,
I recently purchased a 18650 Battery Charge Shield V3
(like this Geekcreit? ESP32 ESP32S 18650 Battery Charge Shield V3 Micro USB Type-A USB 0.5A Sale - Banggood USA)
and encountered the following issues. I would appreciate any help or suggestions from those with experience:
- Simultaneous Red and Green LEDs: When connecting the power supply, both the red (charging) and green (full charge) LEDs light up at the same time.
- USB Type-A Port Not Providing Power: With the switch in the "ON" position, the Type-A USB port does not supply power to connected devices.
Steps I’ve Taken:
- Ensured the switch is in the "ON" position.
- Verified the battery is correctly installed with proper polarity.
- I tested the device without the battery installed, and the performance is exactly the same.
My battery is a standard NCR18650B, and it has been confirmed as working properly in other devices.
I would greatly appreciate any assistance or insights you might have to resolve this issue.
Note: If convenient, replies in Chinese would be appreciated, but English responses are perfectly fine as well.
Thank you!
The battery is not connected. One of the contacts in the battery holder is not making good contact with the battery, or the battery holder is not soldered into the board properly.
If that is not the solution, something may be wrong with the protection circuit. You can test that by shorting the negative battery terminal to the circuit ground, and then see if it works.
Hi. I did some test and here are the results. When connected the power but without a battery, the battery holder is about 4V, so I think the battery should be connected. But when installed a battery but no power is input, 3V out is 0.77V and 5V out is 0.69V. The output voltage can be shortly normal after connected a power and plugged out, but it would get abnormal once when I connect something to the USB output. What's the problem and what can I do for further test? Thanks a lot if you can assist.
I don't know what to suggest. Does your V3 look like this?
If it does, then this is the schematic for it:
If you don't get good output, either 3.3V or 5V, on either the battery by itself or on the external power by itself, then there may be something wrong with U2 - the TP4056. Or there may be a short somewhere. I just don't know how you would find the problem or fix it.
Edit: I don't think this explains the problem, but if you install the battery by itself, you must first temporarily connect the external power to initialize the protection circuit. After that, the battery by itself should work ok.
Thank you so much for your detailed explanations and suggestions. I tried a lot, but I still can't pinpoint the exact issue. At this point, I think I have to give up on fixing this board. Really appreciate your time and expertise for your kind assistance.
If you install the battery, then briefly connect the external power, then remove external power, do you then get anything from either the 3.3V output or the 5V output? If not, then it seems some trace or connection is just not right. In that situation, the battery powers both the 3.3V regulators and the 5V boost converter independently, so if the battery connections are good, at least one would work.
With the battery removed, you might check for continuity between the positive terminal of the battery holder and the input to one of the 3.3V regulators.
