lowest voltage Helicopters • Airplanes • Drones • Builds • Repairs • Consulting • 3D Printing
03/04/2026: @ 08:00: page updated

<< Back
Lithium Iron Phosphate (LiFePO4) cells have a lower discharge cutoff of around 2.5 volts per cell, but most battery management systems and experts recommend not going below 2.8 volts per cell in practice to preserve long term cycle life. The General Voltage Thresholds The nominal voltage of a LiFePO4 cell is 3.2 volts. A fully charged cell sits at around 3.6 to 3.65 volts. You start getting into the caution zone below about 3.0 volts, and below 2.8 volts you risk accelerating degradation. Going below 2.5 volts is considered the hard damage threshold where you can cause permanent capacity loss. Compared to Regular Lithium Ion This is actually one of the advantages of LiFePO4 over standard lithium ion or LiPo cells. They are considerably more tolerant of deep discharge and abuse. A regular LiPo cell damaged below about 3.0 volts can become unstable, whereas LiFePO4 is much more forgiving and far less likely to experience thermal runaway. Practical Takeaway For your backpack battery project, if you go with LiFePO4 cells instead of standard LiPo you'd have a much safer chemistry to work with, especially in a carried-on-your-body application. The tradeoff is slightly lower energy density, meaning the pack will be a bit heavier or larger for the same capacity compared to LiPo. For a safety-conscious DIY build though, many people consider LiFePO4 the smarter choice.