System-S Backup Battery Charger Extender For Palm Palmone Lifedrive TX Treo 650 TUNGSTEN T5 E2 Treo 650 680 700p 700w wx 750 750v 755p Centro Gandolf Z22 nsert four conventional 1,5V Mignon AA size batteries into the pack and have a portable power source Total running time with connected battery adapter will be extended for hours (depending on the used batteries up to 8 hours) Eliminates traveling with a ac adapter or charging cradle Charges your battery or provide backup power Lightweight , slim and compact size