diagnostic interface 18 which may comprise for example the world diagnostic system developed by ford motor company for use with obd2 equipped vehicles the wds 18 may comprise for example a laptop computer which can be plugged into an interface that connects a computer to a can bus 48 the diagnostic interface 18 is also directly connected via lines 50 to the emm 16 and high voltage battery 12 information concerning the health of the battery conditioning system is monitored by the vehicle controller 64 which is also connected to the can bus 48 faults or malfunctions in the battery cycler 10 are recorded and date stamped by the vehicle controller 64 and these faults may be accessed and diagnosed by the diagnostic interface 18 the emm 16 monitors the charge state of batteries 12 and 14 and controls the operation of the battery cycler 10 in operation the user connects the battery cycler 10 to the vehicle using the quick disconnect electrical connectors 56 and 58 the user then depresses the push button 62 causing a 5 volt signal to be delivered from the low voltage board 26 on line 36 to the emm 16 where it is interpreted as a request to begin conditioning of batteries 12 14 emm 16 is responsive to this request signal to assess the current state of charge of batteries 12 14 as well as determine the interval of time that has elapsed since the high voltage battery 12 was last fully discharged to eliminate battery memory depending upon the results of this assessment emm 16 sends a control signal on line 40 to the battery cycler.