Where heat comes from and how to get rid of it.
Heat sources: current, resistance, environment
High current through resistance is the main internal source; ambient temperature is the external one.
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Passive and active cooling options
Spacing and conduction handle most packs; fans are for genuinely high-rate systems.
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.
