LiFePO wered/Pi+ 4 Introduction The LiFePO wered/Pi+ is a high performance battery power system for the Raspberry Pi. It can 4 power a Raspberry Pi for up to 9 hours from the battery (depending on installed battery size, Raspberry Pi model, attached peripherals and system load) and can be left plugged in continuously. It features: A single 3.2 V, 18650 size 1500 mAh LiFePO (lithium iron phosphate) cell or optionally a 4 14500 size 600 mAh LiFePO cell, providing high power density, extended cycle life (2000+ 4 cycles), and safety from fire and explosions. Continuous output load current of 2 A with the 18650 size battery, both when connected to external power and when on battery power. A smart charge controller with over-charge protection, allowing the device to stay plugged in continuously and provide UPS (Uninterruptible Power Supply) functionality. Smart auto-adjusting charge current allowing charge currents up to 1.5 A when used with high LiFePO wered/Pi+ product brief 1 Rev 12 - 09/08/20 4LiFePO wered/Pi+ 4 power chargers, but automatically reducing current as needed to not overload lower power sources such as a PC USB port. Customizable MPPT functionality making it possible to charge the LiFePO wered/Pi+ from 4 suitably sized 5 18 V nominal solar panels. 2 Two-way communication between the power system and the Raspberry Pi over I C bus (to monitor voltages and customize settings) and Raspberry Pi shutdown detection. A smart power manager controller and open source daemon working in tandem to provide clean shutdown functionality and over-discharge protection, resulting in long life and high reliability. Continuous measurement of input voltage, battery voltage, output voltage and load current with smart user programmable thresholds for boot, shutdown and hard power down. An on-board mechanical on/off button providing clean boot/shutdown capability even in headless setups, with convenient connection points to add an external button if desired. Press and hold button functionality protecting against accidental button activation and enabling the possibility to use short button presses to control user software. A green PWR LED indicating the Raspberry Pi power state, providing feedback to the user and controllable by user software, plus convenient connection points to add an external power LED if desired. A separate red CHRG LED indicating charging state, plus convenient connection points to add an external charge LED if desired. A wake timer allowing the Raspberry Pi to be off most of the time and wake up as needed for low duty cycle applications. Real-time clock functionality, keeping track of time when the Raspberry Pi is off and restoring system time on boot, with the ability to wake up at an absolute time. An auto-boot feature maximizing uptime by making the Raspberry Pi run whenever there is sufficient battery power, or when the input power is present or absent. An auto shutdown feature making it possible to automatically shut down the Raspberry Pi immediately when input power is been removed or after a programmable amount of time. A flexible watchdog timer able to alert a user by flashing the PWR LED or trigger a shutdown if the user application fails to service the timer within a configurable amount of time. In combination with the auto-boot feature, this can greatly improve reliability by allowing the system to reboot to a known state if the user application crashes or becomes unresponsive. LiFePO wered/Pi+ product brief 2 Rev 12 - 09/08/20 4