Battery University™ is a free educational website that offers hands-on battery information to engineers, educators, media, students and battery users alike. The tutorials evaluate the advantages and limitations of battery chemistries, advise on best battery choice and suggest ways to extend battery life. The material is based on “Batteries in a Portable World – A Handbook on Rechargeable Batteries for Non-Engineers” (3rd edition). The 328-page book is available to purchase on-line. Battery University™ is sponsored by Cadex Electronics Inc., a manufacturer of advanced battery chargers and test devices.