Sonic Booster 12V Mode D'emploi page 50

3.4. Storage
The Booster can be stored in any position, without any danger for the battery,
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because it is a dry battery, pure lead.
When not using the Booster for long periods of time, recharge the unit with the
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original automatic electric 230V or 110V AC /12V DC charger every three months
for 48 hours.
Do not store your Booster below 0°C (32° Fahrenheit) if you want
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to use it urgently. Too cold, the Booster will miss performance.
The ideal operating temperature is between 10 to 25°C
(50 to 77° Fahrenheit).
Clamps must be stored on their support posts, ensuring they do not come to con-
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tact with any metallic surface.
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