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Back to Timeline !technology @Wispy2891
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@finalarbiter@lemmy.dbzer0.com on lemmy.dbzer0.com Open parent
mAh/g (milliamp-hours per gram) is a similar unit, but it’s missing the voltage term. We can do a little dimensional analysis here to translate between them. Power = Current * Voltage, so you’d multiply this (CurrentTime)/(Weight) value by the nominal voltage of the cell to get to (PowerTime)/(Weight). So it is essentially still a measurement of capacity, but in terms of current instead of power. Phone batteries are often specified in units of Current*Time (e.g. milliamp-hours), but I’m not sure why.
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Wispy2891
Wispy2891 in !technology
@Wispy2891@lemmy.world · Feb 25
I’m not completely sure why I think it’s marketing 5000 mAh is much a bigger number than 19 Wh and marketing loves huge numbers Kinda like BMW did with the i3. In 2013 Tesla was selling a model with a 60 kWh battery so BMW had the genius idea to install a 20 kWh battery BUT refer to it as “60 Ah” battery. Tesla introduced the 90 kWh battery? BMW responds with a 94 Ah battery (28 kWh) Newest Tesla has 100 kWh battery now? BMW has 120 Ah battery (38 kWh) “See? Higher number!”, says the marketing And in order to have a comparable range number they had to implement heavy weight reduction techniques like using carbon fiber for the body, negating any cost saving from the smaller battery AND giving the owner a total loss after small collisions as it shatters instead of bending
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