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The present invention relates to the lead acid battery that is capable of successfully discharging gasoline occurring in the inside of the guide acidity battery towards the exterior thereof.
 As a secondary battery that is carried on board an automobile or a charter boat, there is utilized the lead acidity electric battery. Ahead(p) acidity electric battery, in case where an overload occurs, water, that is an electrolyte, electrolyses to create hydrogen gasoline and air gas. In case where the gasoline remains as it is, the interior pressure from the lead acid electric battery increases, using the result that a pot is actually expanded in order to therefore reduce the performance from the lead acid electric battery. Within the worst of all, there's a concern how the lead acidity electric battery could be broken. Because of this, the gas must be discharged out of the inside of the lead acid electric battery. In the case of the guide acid battery with a manage valve, in the cover part thence, you will find got rid of a manage control device and a good exhaust interface. In case exactly where gasoline is actually produced in the interior of the lead acid battery and also the internal stress thence is thereby caused to rise up to a given degree of stress or higher, the actual control control device is opened, so that the electrolyte is avoided towards seapage towards the outside of charge acidity electric battery however only the gasoline could be discharged from the inside from the guide acid battery to the outside thereof.