LiFePO4 stands for lithium iron phosphate — the specific cathode chemistry inside the battery, where iron (Fe) and phosphate (PO4) replace the cobalt or manganese used in other lithium chemistries.

The chemistry designation matters because LiFePO4 behaves differently from other lithium-ion types in ways that directly affect safety and longevity. The iron-phosphate bond is significantly more thermally stable than cobalt-based cathodes, which sharply reduces thermal runaway risk. LiFePO4 also holds a flatter discharge voltage curve — staying near 12.8V nominal through most of its discharge rather than sagging — and is rated for 2,000 full-depth cycles at 100% DOD, far exceeding the 200–600 cycles typical of lead-acid alternatives.

  • LiFePO4 nominal voltage: 12.8V for a standard 4-cell pack, not 12.6V like lead-acid.
  • LiFePO4 cycle life: 2,000 cycles at 100% DOD, up to 8,000 cycles at 50% DOD.
  • LiFePO4 weight advantage: roughly 67% lighter than an equivalent lead-acid battery.
  • LiFePO4 safe operating discharge range: -4°F to 140°F; charging must stay above 32°F to prevent cell damage.