My laptop battery charges under a minute, but that doesn't make it any good. If you have no issues with the units / expressions used in the article, could you

My laptop battery charges under a minute, but that doesn't make it any good. If you have no issues with the units / expressions used in the article, could you please explain what is the power and energy density from this quote: > Stanford’s natural graphite aluminum-ion technology delivers 68.7 Watt-hours per kilogram and 41.2 Watts per kilogram, while its graphite-foam bumps up to 3000Wh/kg. > The GMG-UQ battery heaves that forward to between 150 and 160Wh/kg and 7000Wh/kg.