Lenmar Li-Ion Battery for Hewlett Packard iPAQ 500 Series and Hewlett Packard iPAQ 510 Voice Messenger Series Fits HP (Hewlett Packard) HP iPAQ 500 Series Voice Messenger Replaces HSTNH-SK13B, 445074-002, 450790-001, FA889AA 3.7V 1100mAh Lithium Polymer 2 Year Warranty