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Ok, so the battery in question is coin-cell sized & goes in a watch! 16 years ago, I bought a Casio Wave Ceptor watch, which uses a solar cell to recharge the Cobalt-Lithium-Ion coin cell inside it. It's been in daily use, and must have done at least one charge cycle per day, so that's at least 5,800 cycles it's managed. I've just had to replace the battery, as it no longer holds enough power to drive the hands! Ok, each of these cycles will have been pretty small percentages of the battery capacity, but it goes to show that even 2004 tech can last a very significant number of cycles before wearing out. So this bodes well for EV battery life in general, and also suggests that modest cycles help ensure a long lifetime.
 

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Ok, each of these cycles will have been pretty small percentages of the battery capacity, but it goes to show that even 2004 tech can last a very significant number of cycles before wearing out. So this bodes well for EV battery life in general, and also suggests that modest cycles help ensure a long lifetime.
A cycle counts as a full discharge to a full charge. So if you discharge 10% and then charge 10% that's 0.1 of a cycle. This is why big batteries tend to last longer than small batteries, fewer cycles for the same amount of energy. Also not going near the top and bottom of the battery will have a large impact on longevity. There's a lot of very interesting literature out there with regards to battery life depending on how its used.
 
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