Why matched cells matter more than a good datasheet.
Matching criteria and tolerances
Capacity within 1–2% and resistance within a few percent is the usual matching bar.
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What mismatched cells do over time
The weakest cell sets the pack’s usable capacity and its cycle life.
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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 stability and cycle life.
How long does a pack last?
4,000–6,000 cycles at 80% DOD.
Charge in the cold?
Not below 0°C without heating.
Maintenance?
Terminals, ventilation, BMS log.
Safe?
The safest lithium chemistry in wide use.
