Features & Specifications :

1.) Two battery size options :

• 18650 size: 1500 mAh 3.2 V LiFePO4 cell (full specification)
• 14500 size: 600 mAh, 3.2 V LiFePO4 cell (full specification)

2.) High continuous load current whether on battery or external power

• 18650 size: maximum 2 A continuous load current
• 14500 size: maximum 0.75 A continuous load current

• Over-charge protection: allows the device to stay plugged in continuously and provides UPS functionality.
• Auto-adjusting charge current: charge current up to 1.5 A when used with high-power chargers, but automatically reduces current as needed to not overload low power sources.
• Customizable maximum power point (MPP) voltage: obtain maximum efficiency when powered directly from suitably sized solar panels.

•  I2C communication: two-way communication with the Raspberry Pi enables easy configuration, monitoring, and clean shutdown.
• Power manager and daemon: work together to ensure clean shutdowns and provide over-discharge protection, resulting in long life and high reliability.
• Continuous monitoring: input voltage, battery voltage, output voltage, and load current are continuously measured and checked against user-programmable thresholds for boot, shutdown, and hard power down.
• On/off button: provides convenient boot/shutdown triggers even in headless setups, with press and hold function to prevent accidental activation (external button can be added).
• Green PWR LED: indicates the Raspberry Pi power state, provides feedback to the user (external power LED can be added).
• Red CHRG LED: indicates power drawn from external input, whether to charge the battery or power the load (external charge LED can be added).
• Wake timer: allows the Raspberry Pi to be off most of the time and wake up as needed for low duty cycle applications.
• Real-time clock: keeps track of time when the Raspberry Pi is off and restores system time on boot, with the ability to wake up at an absolute time.
• Auto boot: can maximize uptime by making the Raspberry Pi run whenever there is sufficient battery power or when external input power is present.
• Auto shutdown: can automatically shut the Raspberry Pi down when input power is removed, either immediately or after a programmable amount of time.
• Application watchdog: can alert a user by flashing the PWR LED or trigger a shutdown/reboot if the user application fails to service the timer within a configurable amount of time.

• LiFePO4wered daemon: takes care of shutdown and RTC management.
• Command line tool: allows simple configuration and access to all features.
• Shared library, language bindings: C/C++, Python, and Node.js bindings allow integration into user programs.

• 18650 size: 52 mm x 75 mm
• 14500 size: 47 mm x 65 mm

Two Battery Options :

The LiFePO4wered/Pi+ is available in two battery size options, 18650 (larger) and 14500 (smaller). The large version is a 1500 mAh 3.2 V LiFePO4 cell that supports up to 2 Amps of continuous load current. The small version is a 600 mAh, 3.2 V LiFePO4 cell that supports up to 0.75 Amps of continuous load current. Both boards can be modified to use bigger LiFePO4 cells.

                                         Two variants: one for a 18650 battery size (left) and one for a 14500 battery size (right)

Stackable Header :

The LiFePO4wered/Pi+ attaches to the host board using a header and mounting kit (see below). By default, the header is non-stackable, meaning you can’t add other boards once the LiFePO4wered/Pi+ is attached. However, there’s an option for a stackable header which does allow other boards to be attached and powered.