A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LixMyPO4, where 0<x2 and 0. The closure member is constituted by a central core with a flexible, circular ring extending around it and has a head having a diverging profile which closes and opens the first duct as a result of the action of the actuator means. This prevents power that would be supplied to a second motor winding from being also supplied to the first motor winding and causing potential damage to the first motor winding. When only AM4 could have been detected, the test light emission is not carried out and normal recording from GUARD1 is carried out. The methods include methods for masking redundancies in the tracking information, filtering the tracking information, and controlling access to the tracking information. The system further includes means for indicating that the blade should be replaced.