Long shelf life emergency power source

The utility model relates to a long shelf life emergency power source. It is continuous with the air to be equipped with the vent on the lateral wall of electrode cavity, and the air negative pole adopts removable formula to connect and fixes in the electrode cavity, and the air negative pole forms the ring -type, and its bottom has to supply power separates the through -hole that the liquid stream is gone into, and the metal anode adopts removable formula to connect and fixes the intra -annular at the air negative pole, and the metal anode passes through battery system of the continuous formation of wire with the air negative pole to draw forth the wire and connect the interface in power output, the electrode cavity is with water storage cavity intercommunication and pass through threaded connection, and the lower extreme of water storage cavity is equipped with water permeable membrane, and water permeable membrane's top is equipped with the salt bag, and the below is equipped with the water filling port, a