Battery and battery system

A battery system comprising:

• a first battery;
• a first hydrogen sulfide detector that detects the presence of hydrogen sulfide;
• and
• a controller that controls the exhausting unit, wherein
• the first battery includes an outer packaging and a power generating element that contains a sulfur-based material and is included in the outer packaging and disposed in an inside of the outer packaging;
• the outer packaging includes a communicating port, a hydrogen sulfide eliminator, and an exhausting unit;
• the communicating port communicates between the inside and an outside of the outer packaging;
• the hydrogen sulfide eliminator and the exhausting unit are disposed in the communicating port;
• the exhausting unit introduces hydrogen sulfide generated caused by the sulfur-based material to the communicating port;
• the hydrogen sulfide eliminator eliminates the hydrogen sulfide introduced to the communicating port by the exhausting unit;
• the first hydrogen sulfide detector detects the presence of hydrogen sulfide in the inside of the outer packaging;
• the first hydrogen sulfide detector generates a first detection signal when hydrogen sulfide is present in the inside of the outer packaging;
• the first detection signal is input into the controller;
• and
• the controller controls the exhausting unit according to the first detection signal.