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Where is the positive and negative terminals on this battery?

mantonio

@copilot Where is the positive and negative terminals on this battery?

copilot

It seems like your project's description doesn't include a specific battery component. However, I can offer you some general guidance on identifying the positive and negative terminals of most common battery types:

Standard Cylindrical Batteries (e.g., AA, AAA):
- The positive terminal is usually marked with a "+" and is the smaller circular end.
- The negative terminal is usually flat and may be marked with a "-".
Button Cell Batteries:
- The larger flat side is typically the positive terminal and is often marked with a "+".
- The smaller side is the negative terminal.
Lithium Polymer or Lithium-Ion Batteries:
- These might have marked wires or pads. The red wire usually indicates positive ($+$), and the black wire indicates negative ($-$).

If you provide the specification or model number of the battery, I can offer more detailed instructions specific to your battery type. Alternatively, if you specify where you need to connect the battery in your project, I can help with those connections.

mantonio

I want the pendant to be usb charged

copilot

To create a USB-charged pendant, you can use the MCP73831T-2ACI/OT as a lithium-ion or lithium-polymer battery charger. Here's how you can connect these components:

Connections:

USB Connector (Mini/Micro/Type-C)
- USB 5V (VCC):
  - Connect VCC from the USB connector to $U4: VIN$ .
- USB GND:
  - Connect GND from the USB connector to $U4: VSS$ .
MCP73831T-2ACI/OT Charger
- Battery Connection:
  - Connect $U4: VBAT$ to the positive terminal ($+$) of your battery.
  - Connect the negative terminal ($-$) of the battery to a common GND.
ESP32-CAM and other components:
- Powering the ESP32-CAM:
  - Connect $ESP32-CAM1:5V$ to the battery's positive terminal.
  - Connect $ESP32-CAM1:GND$ to the battery's negative terminal.
Battery Status Indicator (optional):
- Status LED:
  - Connect an LED with a current-limiting resistor between $U4: STAT$ and GND. The LED indicates the charging status.

Detailed Connection List:

Connect USB 5V (VCC) to $U4: VIN$ .
Connect USB GND to $U4: VSS$ .
Connect Battery positive terminal to $U4: VBAT$ and $ESP32-CAM1:5V$ .
Connect Battery negative terminal to a common GND and $ESP32-CAM1:GND$ .
(Optional) Connect an LED and resistor between $U4: STAT$ and GND to indicate charging status.

By following these connections, you can achieve a USB-charged pendant with the capacity to charge the battery and power the embedded components like the ESP32-CAM and sensors.

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Reviews

Ground
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Distributor	Qty 1
Arrow	$2.33–$3.16
Digi-Key	$6.67–$11.60
LCSC	$18.41–$18.45
Mouser	$4.34
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