22 points

The same exact reason ISPs sell bandwidth in Mb/s, instead of the proper unit.

Quite simply, 500Mbit/s sounds a lot more impressive than 0.5Gbps or 62.5MB/s.

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5 points

But bits is the correct unit.

Speed is measured in bits, storage is measured in Bytes (unless you are Microsoft)

Your argument you be like saying 'why say a car that can do Kilometres per hour when it is really going cubic kilometres per hour.

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15 points

Not really, since bits and bytes represent the same dimension of data.

Your argument is like saying “why say a car can do km/h when it is really m/s”

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14 points
*

It leads to a lot of confusion for customers though, who think their Internet connection is 8 times faster than it is.

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5 points

Welcome to marketing.

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39 points

mAh is a bigger number than Wh and looks better on packages.

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8 points

And mWh is even bigger.

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2 points
*

You wanna talk about inflating numbers?

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16 points

Wait until you hear about µAh. This is the one secret the engineering team doesn’t want the marketing department to know.

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9 points

Lets use coulomb hours or electron-per-second-hours.

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6 points

LOL, electrons per second hour is such a cursed unit, it’s going to take some effort to make it worse.

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9 points
*

For the same reason Audi didn’t sell the Audi “5”, Pontiac never sold a “6LE”. and Saab didn’t try to sell the “9 turbo”. It sounds more impressive with the zeros added.

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20 points

Laptops predate cell phones in mainstream use. When laptops started, there were a variety of battery types in use with no standard charging voltage so Wh was the fair way to compare.

Cell phones have pretty much always been 3.7v lithium so mAh is a fair comparison and gives a bigger number than Wh.

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16 points

You could just put it in mWh. BAM, bigger number.

3000 mAh * 3.7V = 11.100 mWh Much bigger. Much better.

I hate mAh… it’s absolutely no information how much energy is inside without taking the voltage into account. If you use directly (m)Wh, you directly have the amount of energy the battery can contain.

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7 points

The thing is, batteries are measured in Ah, and not Wh. That’s because their voltage changes all the time, and is mostly the same for the same kind of chemistry, and also because for most of their uses, the current is the actually useful information.

Phones are just using the standard metric. It’s laptops that are weird.

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4 points

They both tell the same story, but one requires extra information you don’t have. You don’t say that the latest i3 pulls 6 Amps, you say it pulls 65 Watts. Also the voltage does change as the battery discharges, that’s why you use the nominal voltage of the pack. mAh is also not a current

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4 points
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More like 4-4.4v when fully charged. They should actually list the voltage as well as it affects longetivity

Eidt: voltage

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2 points

Most phone batteries are rated for 4.3v

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1 point

Most people have low end phones though.

And those are rated around 3.7v

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42 points

Generally Li-ion (3.7V nominal) batteries were used so they could just base it off of current usage rather than power usage and you could get a decent idea comparing between smart phones.

Laptop batteries tend to use an operating voltage of multiple times that (2-cells would use 7.4V-ish, 3-cell would be 10.8 to 11.4V nominal, 4-cell would be 14.8V and so on), but the number of cells can vary wildly per model, so Wh is easier to compare numbers between laptops.

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10 points

EE Here, I like this answer.

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