[_ea1k]

The enemy of batteries is heat. Most laptop batteries that I have had degraded prematurely due to poor heat management.

Phones are kind of a different case. The phones that I have had with bad batteries to begin with (Galaxy S2, Nexus One, etc) were often recharged multiple times per day. 1000+ cycles per year for two or more years will degrade the battery a lot, as the degradation is largely based on the number of cycles.

The Tesla P85D has a ~300 mile battery. Unless you are driving 300 miles per day, you are unlikely to see 1000 cycles in a year. If you do cycle it 1000 times, you've put 300,000 miles on it.

That is really a completely different situation from the typical mobile phone or laptop usage scenario.

[raihansaputra]

Really interesting point.

Out of topic, but is it possible that is this why phone manufacturers are shying away from putting bigger batteries in their flagships? They want the batteries to degrade in the 2 or 3 years of daily power cycle, and most people choose to upgrade instead of replacing their non-user-replaceable battery. Does this make sense?

[_ea1k]

I have often wondered the same thing. It seems like batteries in phones sometimes actually get smaller for no reason that makes sense to me.

It might just be that the manufacturers think everyone wants a thinner device, though.

[toomuchtodo]

I expect the soon-to-be-released 100kW pack to be even more durable due to further reduced cycling.