http://www.a123systems.com/
100C discharge rate, power density of 3000 W/kg, and won't explode from shock or overcharging like a conventional Li-ion battery, ability to charge to 90% in five minutes. DeWalt is using these for their 36V equipment. I am not able to find data on energy density but I am assuming it is the same as for a standard Li-ion cell, or 110-200 Wh/kg (low value from batteryuniversity.com's 110-160, high value from Wikipedia's 150-200). For any mass-sensitive application whose discharge time is measured in seconds or minutes rather than hours, these are probably worth looking into.
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