In response to the demand for a smaller and lighter valve-regulated lead-acid (VRLA) battery for motorcycle use, and which retains the performance of the present model, Yuasa has developed a new YT4B model battery. Although this battery is lighter, it possesses similar or even better performance than the two present version in terms of high current drain, capacity retention during standing at high temperature, and recovery by charging after overdischarging. The new battery uses thinner plates, made possible with an expanded grid for better performance. It also features a wet (electrolyte-filled) and charged design for easy handling when installing, and has the same level of safety as the standard YT4B technology. (C) 2000 Elsevier Science S.A. All rights reserved.