Trojan Battery’s OverDrive AGM 31 battery is the only cycling AGM battery that meets the demands of idle reduction systems, according to the company. Trojan Battery says it is a true truck cycling battery that delivers exceptional and steady power, long life, excellent recharge efficiency and maintenance-free convenience. The OverDrive AGM 31, which comes with a 30-month warranty, has been chosen for use in APU systems by Bergstrom, Diamond Power Systems, Idle Free Systems, Red Dot and Sleeping Well.