Depassivation

Depassivation

Many applications may cause the cell voltage to dip below the minimum required operating voltage of the user's device. If the device cannot handle this dip in voltage (i.e., reset, turn-off, fail, etc.), then the cells must be "depassivated" prior to use. Depassivation consists of placing a resistive load or a constant load on the cell for a short period of time. The purpose of this is to pre-condition the cell to where it does not drop below the minimum voltage of the device once the load is applied. This is done by advancing the discharge past the point of the voltage dip.

De-Passivation Procedure for Tadiran TL-6537

Load battery with 24 ohm per cell (150 mA/cell) for 30 minutes. Depassivated cells should show voltage of 3.5 V - 3.6 V (under load, at the end of the depassivation procedure). If battery voltage does not reach the specified voltage, follow the following procedure.

Cells older than 1 year or cells that seem passivated: 1. Load battery with 900 ohms per cell (4 mA/cell) for 24 hours. 2. Load battery with 24 ohms per cell (150 mA/cell) for 30 minutes. Depassivated cells should show voltage of 3.5 - 3.6 V (under load, at the end of the depassivation procedure).

Partially Discharged Batteries: 1. Load battery with 900 ohms per cell (4 mA/cell) for minimum of 72 hours (this consumes 100 mAhr/day). 2. Load battery with 24 ohms per cell (150 mA/cell) for 30 minutes. This should be done within 24 hours of step 1 and just before loading the battery for actual use.

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