, external Vin or external Vout. Max current
for the overall system is 2.5A. External battery can be Li-Polymer, Li-Ion or Li-PO4. Please use Jumper J4
to select chemistry. Li-Ion and Li-Polymer share the same jumper setting.
Current for the UPS is limited to 2.5A via a current limit resistor. Since the USB connector provides
power for charging the battery and is also providing power to devices connected via Pi-UpTime UPS 2.0,
a 3.5A power supply is recommended. We also recommend using good quality USB cables to minimize
power loss via USB cables. Using the USB-C connector is recommended for Power In.
3.3V UPS power is available via terminal block J2. Maximum of 0.7 Amps can be drawn from this
connection. This is useful to provide power to external sensors, IoT and other electronic devices.
Batteries or spacers are not included.
Key Features
•Provides UPS using one or two rechargeable 18650 Lithium batteries in battery holder or connecting
an external battery. Batteries are not included. An external battery can be used instead of onboard
battery connectors. Unit is agnostic to battery capacity. Charge and UPS run-time will vary according
to battery capacity.
•Choice of Li-Ion, Li-Polymer or Lithium-Phosphate batteries. Jumper selectable (Li-Ion / Li-PO4) battery
chemistry via jumper J4. Both batteries in the battery holder must be identical. Battery chemistry
selection is done via J4. Default selection is for Li-Ion. Li-Polymer batteries can be used with an
external connector. For Lithium Polymer batteries, use the Li-Ion battery setting on jumper J4.
•Install one or two 18650 batteries (not included). Please ensure the batteries are installed with the
proper polarity. Reversing the polarity will damage the electronics.
•Includes full Battery Management System (BMS). Charges the battery when power is available using
CC-CV charging methods. Depleted batteries are charged initially at a low current, allowing batteries
to recover.
•On board ADC allows Vin, Vout, Battery V and temperature monitoring via I2C. Sample Python code
can be downloaded for use. The sample code can be modified to adapt to your needs. NO GPIOs are
used. Only an I2C bus is shared with other I2C peripherals. Valid I2C addresses are 0x48, 0x49, 0x4B.
Default address is 0x49.
•System turns off all power and shuts down when batteries fall below 2.6V, protecting the batteries.
•Power reset is done by pulling off the Power on/off shunt on Jumper J3. By connection an on/off
switch to jumper J3, power can be turned on or off as needed. Switch can be connected via a 2.54mm
cable header. This cable can be purchased from several places. Such a cable is available, for example,
on Amazon from Alchemy Power, product id B07FXXDN2M.
•Using spacers, Pi-UpTime-UPS can mount securely on Raspberry Pi-4, Pi 3B+, 3, Model A etc.
•Maximum battery charge current is limited to 1A. Battery charge time will vary based on battery
capacity and battery charge level.
•Several safety features are built-in on Pi-UpTime UPS 2.0.
oIncludes Battery Management System (BMS) which maintains CC-CV charging and
maintains the charge level for Li-Ion or Li-PO4 batteries, once the batteries are charged.
