What makes different battery technologies better for different applications, primary and secondary batteries, state of charge (SOC) vs. depth of discharge (DOD), voltage vs. charge, battery open circuit voltage, battery internal resistance, lithium vs. lead acid, battery nominal voltage, 3.6V, 3.2V and 2V, cycle life factors, energy per weight, energy per volume, power per weight vs. energy, arbitrage, self consumption, max discharge current vs. continuous current, charge voltage vs. nominal voltage vs. float voltage, BMS,  algorithms,  NiMH, NiCad, recycling batteries.

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