Some users of Li/SOCl2 cells store them at elevated temperatures prior to use. As was discussed previously, at temperatures of 100°C or more, the rate of passivation during open circuit storage is high enough to cause severe passivation in relatively short periods of time. This problem is usually seen in pulsed current applications or when a battery pack is used as a back up power source to be turned on when the primary power source is depleted. Passivation of the “back up pack” while the “primary pack” is in use may make it temporarily unusable when it is first required. This is particularly true of equipment that requires constant power.
If the application requires the additional capacity of a “back up” it is recommended that the user run both packs in parallel throughout the discharge instead of switching to a “secondary” pack when the “primary” pack is exhausted.
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