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8.4. BATTERY SELECTION AND CHARGING

determined based on the open circuit (or very light load) potential diﬀerence.

This relationship is not linear, however and the measurements are temperature

dependant. Higher temperatures give higher potentials for the same state of

charge (SOC). Lower temperatures result in lower voltage readings and a

decreased storage capacity [23]. At 0

◦

C, only 85% of the battery’s rated

capacity is available [24]. Figure 8.3 shows the battery’s state of charge for

given open circuit voltages at 25

◦

C. Although this relationship is non-linear,

the temperature-SOC relationship is approximately linear and the interaction

of these two variables can be linearly approximated as

SOC = 92V

− 14T − 750,

where V

is the open-circuit voltage and T is the temperature in

◦

Figure 8.3: Battery SOC vs Open circuit voltage.

Showing actual SOC and estimated SOC at 25

◦

C. Data from [23] and [25].

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Wavecom GR64 UART Sleep Protocols Specifiche Pagina 108