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As fuel costs and anti-idling legislation become more prevalent, the life cycle cost of the energy storage component of no-idle systems is becoming a critical consideration. Current systems employ up to four AGM lead-acid batteries, with a one year standard warranty. OEMs have reported higher than acceptable warranty claim levels and are interested in examining the potential advantages of alternative storage technologies. The use lead-carbon asymmetric hybrid battery/supercapacitor energy storage in the no-idle system application is examined through modified SAE J2185 cycle testing and other means - as these battery products have significantly improved rechargeability (charge acceptance) and longer life (up to 4x higher cycle life in deep cycle applications). The performance improvement is expected to provide shorter recharge times and reduced warranty claims. The technology could potentially offer means to a lower capacity alternator, thus reducing cost.

The rapid deterioration of dynamic charge acceptance (DCA) of all varieties of lead-acid batteries severely limits micro-hybrid vehicle performance. This weakness is a result of early and rapid negative plate sulfation which profoundly decreases DCA, thus increasing charge time. As a result, the possible engine-off time required for improved fuel efficiency and emissions reduction is limited. Automotive manufacturers are planning to increase the engine-off time for next-generation micro-hybrid vehicles (Micro-II hybrids) by shutting down the engine during low speed decelerations. This advancement will necessitate batteries with higher DCA and greater stop-start cycle life. These requirements cannot be met by conventional or advanced lead-acid batteries.