Pi18650 Li Ion Battery HAT

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1 Pi18650 Li Ion Battery HAT Pi18650 Li Ion Battery HAT Page 1

2 Description: The Pi18650 is an add on HAT which plugs into the 26/40 pin connector on the Raspberry Pi. This HAT allows you to operate your Raspberry Pi without a power cable and can use various capacity Lithium Ion batteries. On board is a 1A battery charging circuit for charging the battery. The Pi18650 development board also includes a 4x2 100mil header for use with a ESP8266 (ESP-01) wifi module for remote monitoring and CLOUD integration. Included is one additional stacking header for extra clearance when stacking other HAT's on top of the Pi The Pi18650 works with most 5V wall adapters with 1A rating but we recommend higher current ratings of at least 2A if it is used in UPS applications. The power adapter charges the battery while supplying power to the Pi (or SBC). The charging is cut off once the battery is full and should only be used with batteries with internal protection circuits. Removing the power adapter will cause the Pi18650 to seamlessly switch over to battery backup with no interruption. There are two jumpers, one by the positive terminal for removing all load on the battery so the battery can remain in the holder. The other jumper near the 8 pin header is used to turn off power to the Pi (or SBC). A Python script is provided to monitor the battery voltage, chip die temperature and shutdown the unit in case of low battery for proper Os shutdown. The script is written in a class so that it can be imported into other programs. How It Works: The Pi18650 holds a single cell lithium Ion form factor battery which should have an integrated battery protection circuit. The boost circuit maintains the voltage to the Pi at 5.1V for battery voltages of 3.7V to 4.2V. The jumper allows you to disable power to the Pi and Isolate the battery circuit or start the Pi. It also includes a charging IC which can charge up to 1A from the USB Micro connector and has a battery monitoring IC which communicates to the Pi via I2C.. Any DC power supply, adaptor or solar panel up to 18V max can be used with the charger. Use a good quality USB Micro cable as we found the flat style thinner cables did not work well with the charger and current was limited. The thicker round USB Micro cables work well. LED Status for the charging IC: STAT1 (ON) STAT2 (OFF) - Pre-Conditioning or Fast Charge Mode STAT2 (ON) STAT1 (OFF) - Charge Complete PWRGD (ON) - Power Is Good For Charge Pi18650 Li Ion Battery HAT Page 2

3 Features: 1A Charge Current Max Up to 2.4A for Raspberry Pi/SBC via Li-Ion Battery Up to 16V DC Input for UPS and Charging I2C Battery Monitoring (Python Script) Single Cell Lithium Ion Holder 26/40 Pin Connector for Raspberry Pi USB Micro Connector for Charging Jumper for Pi/SBC On/Off/Charge Voltage Regulation 5.1V Charge using a Solar Panel Wifi Header for ESP8266 (8 Pin Board) Use Cases: UPS (with various backup times depending on battery capacity and load) Remote battery operation Data logging Research and Development Technical Specifications: Charge Current: Operating Temperature: Charge Time: Backup/Operating Time: ROHS Compliant: Operating Input Voltage: UPS Mode: Battery Only Mode: 1A DC Per battery specifications Varies with battery capacity Varies with battery capacity Yes 5V - 18V DC Up to 1.2A for Raspberry Pi/SBC from supply Up to 2.4A for Raspberry Pi/SBC Pi18650 Li Ion Battery HAT Page 3

4 Calculating Operating Times: The Pi18650 uses form factor Li Ion batteries which come in various sizes of capacity. To calculate the run time on a battery, an example is provided below. The total current consumption or all attached peripherals to the Raspberry Pi/SBC can be measured via the jumper by the +ve battery terminal. As an example the Raspberry Pi Zero uses approximately 87mA without and 103mA with a USB dongle plugged in. With a fully charged 3000mAh battery, the Pi would last 34.5 Hrs with nothing attached and load at 87mA. Battery Capacitry / Load = Run Time 3000mAh / 103mA = 29hrs Block Diagram: USB Micro 5V - 18V DC INPUT, CHARGING CCT. 5.1V / 3.3V REGULATION, REVERSE BAT. PROTECTION CIRCUITRY BATTERY HOLDER 26/40 PIN HEADER 100mil ESP8266 HEADER Pi18650 Li Ion Battery HAT Page 4

5 Mechanical Drawing: ESP8266 Connections: On the Pi18650 there is a 2x4 Pin 100mil header to accommodate an ESP or custom module to for remote boot operations on the Pi. A device tree blob (dt-blob) file is needed to keep the output to a mosfet high while the Pi is running in order to prevent false reboots from the module. The image below depicts the connections to the header. Pi18650 Li Ion Battery HAT Page 5

6 Pi18650 Li Ion Battery HAT Page 6

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