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They showed that their system could efficiently convert CO2: It generated current densities of more than 300 milliamperes per square centimeter.

The low-impedance electrodes are six to 10 square millimeters in area and deliver up to 10 milliamperes of electric current between adjacent electrodes—enough to modulate the excitability of a million or more nerve cells.

One is the battery, which has gotten a size bump to 4,000 milliampere hours — up from 3,300 mAh — which the company says should extend the battery life beyond a day of use.

By implanting recording electrodes inside the cadavers’ brains and applying TES externally, the researchers found that they needed to zap the scalp with about 4 to 6 milliamperes of current—well above typical current levels.

The Galaxy Note 7 featured one of the biggest battery capacities so far for smartphones at 3,500 mAh, or milliampere hour, which gave it the highest energy density of all Samsung’s devices.