Reply to post: Re: We'll never get longer lasting batteries...

Google begins to roll out Lollipop to Nexus devices

Steve Knox

Re: We'll never get longer lasting batteries...

It's way simpler than that harebrained conspiracy theory.

Every time we get better batteries, we use that improvement to make them work harder, rather than last longer.

Compare what the average person does with a smartphone now with what they did just ten years ago.

And you're surprised that the batteries don't last longer?

As for the car battery analogy, the amount of power needed to move something as heavy as an automobile for even a few miles at any reasonable speed is at least a full order of magnitude greater than that needed to power a high-end smartphone for a week.

My Samsung Galaxy S5 gets 2-3 full days at moderate usage on a 3.85v 2800mAh (= 10.78Wh) battery. At 3x my usage, it would take a 75Wh battery to keep that phone running for a week.

My Prius C, on the other hand, can drive for 1-2 miles at up to 30MPH on its battery, which is a 144-volt 6.0Ah (=864Wh) battery.

As for a 1000+ mile range on a 15-minute charge? Bollocks.

To get a 1,000 mile range at a pedestrian 30MPH that Prius C would require a 432kWh battery (assuming best case scenario, and increased battery weight fully offset by motor efficiency improvements), or roughly 4,007 Samsung Galaxy S5 batteries.

(For a check, gasoline contains about 33.3kWh per US Gallon. Since a good gasoline engine pushing a small car might get 50MPG (US) at 30MPH, that would mean 660kWh of energy to go 1,000 miles. So I am being quite optimistic for the battery here.)

To charge that battery in 15 minutes with a perfectly efficient charger would require 1,728kWh, or about 7,200 amps at 240 volts.

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