System-S Backup Battery Charger Extender For HTC Titan Thoth Tempo Ted Canary Breeze Apache Baker Needle Tanager T829X T828X T737X T535X T727X T424X T323X T222X Sonata Sedna S740 S730 S720 S711 S710 S640 S631 S630 S621 S620 S530 S520 Insert 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