DocID023052 Rev 2

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AN4085

Discharging the EFL700A39 battery

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Discharging the EFL700A39 battery

3.1

Minimum discharge voltage

The cut-off voltage is the minimum open-circuit voltage (OCV) across the EnFilm battery.

Under DC conditions, when discharging with a constant current lower than 5 mA, the

EFL700A39 cut-off voltage value should never be lower than 3.0 V.

During a pulse current above 5 mA with a pulse duration lower than 100 ms, to compensate

the internal ohmic resistance of the EnFilm battery, the EFL700A39 voltage can decay

below 3.0 V. Nevertheless, this dynamic voltage drop shall remain above 2.0 V and the

battery cut-off voltage shall recover a minimum of 3.0 V after the pulse as shown in the

Figure 3.

Figure 3. Minimum discharge voltage

Below those minimum cut-off voltage values of 3.0 V under DC conditions and 2.0 V under

pulsed conditions, the EnFilm™ battery can be irretrievably damaged.

Battery charger devices integrating an over-discharge protection feature or any custom

discrete protection circuit can be used to secure the minimum battery discharge voltage.

3.2

Discharging with continuous current

3.2.1

Discharging characteristics

The Figure 4 shows the typical discharge characteristics of the EFL700A39 battery for

different discharge current values from 1 µA up to 5 mA. These battery discharge curves