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I reckon it has to be. I have hearing damage due to nearly a decade working in a noisy environment while in the RAAF. I used to work in the Melbourne CBD and didn't notice it too much at the time, but I have spent the last ten years out of that environment.
Now when I have call to go in to the CBD I am astounded by the general noise levels, I could not stand working there every day now, let alone living there. I understand why so many people get about with big earmuff style headphones on, probably deafening themselves with music instead.
Regards battery life and charge percentage, I would bet a decent bottle of scotch that the bean counters set the charge scheme, based on getting a high enough percentage of battery packs out of warranty before failure while claiming the absolute maximum of range that the extra sales are expected to more than offset the warranty costs.
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