Conventional automotive batteries have been used in agricultural equipment. However, these batteries do not necessarily respond to what the user actually needs. The following complaints are often heard: * Engines do not start after long-term off-season storage. * Inconvenient services, such as recharging, are required. * These heavy batteries have no place to hold on to and is hard to carry.These problems occur simply because regular automotive batteries are applied.To create a truly appropriate battery for this application, some extensive study of actual use of batteries in agricultural equipment have been conducted. A sealed maintenance-free battery that is perfectly suited to this application, requires no service maintenance work, and results in no messy acid leakage was developed.