What the numbers on a datasheet mean, and which ones matter.
Capacity, energy and C-rate
Capacity is amp-hours at a stated rate and temperature; energy is that times voltage.
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Cycle life, temperature and tolerances
Ask for the test conditions behind the cycle-life number, and the operating temperature window.
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LiFePO4 questions
Short answers to the ones that come up most.
What makes LiFePO4 different?
Lower energy density than NMC, far better thermal stability and cycle life.
How long does a pack last?
4,000–6,000 cycles at 80% DOD — eight to ten years of daily cycling.
Can it be charged in the cold?
Not below 0°C without a heater; discharge in the cold is fine.
Does it need maintenance?
No watering, no equalising — terminals, ventilation and the BMS log.
Is it safe?
The safest lithium chemistry in wide use: no cobalt, stable at temperatures where NMC vents.
