Tel Aviv University researchers under the direction of Menachem Nathan, Emanuel Peled, and Dina Golodnitsky have developed a fast-charge nanobattery that might protect handheld devices from power source related fire hazards. The nanobattery, measuring ~1 sq. cm, consists of ~30,000 lithium batteries connected in parallel on a 0.5 mm thick nonconducting substrate. It offers the best of both worlds—the internal resistance of a thin-film battery and the high capacity of standard lithium versions. The substrate increases battery charge capacity up to 10 mAh/cm2 . They have been demonstrated good for hundreds of charge/discharge cycles.