Adtranz is fitting nickel-cadmium batteries instead of lead acid to the Turbostar diesel trains it is building for Chiltern Railways. The new nickel-cadmium batteries last twice as long as conventional nickel-cadmium versions because they are plastic bonded.
Because the batteries will be used frequently, Adtranz prefers to run them on cycles, by discharging and recharging them. This technique allows the process to take place more quickly. Each carriage in the three-car unit is fitted with two batteries – one for engine starting and one for auxiliary services in emergency conditions, such as lighting, air supply fans and braking equipment