I think the “80% capacity after 1000 cycles” is tested on laboratory environment, typically charging at constant current 0.5C until 4.4V(55Wh)/4.45V(61Wh) then constant voltage until current is 0.03C before cutting off charging, then discharging at 0.2C until the battery is exhausted, measure the capacity, repeat, repeat 1000 times.
The problem is laboratory environment is ideal, the temperature is kept at 23°C during all time, charging/discharging cycle is done repeatedly with little to no time kept at full charge(low degradation over time). The actual charging is quicker (1.0C initially then 0.7C), the temperature is higher(in the computer casing), laptop plugged in time is longer than using battery more often than not, even 60% limit is higher than the ideally 30%~40% charge for long-term storage.
In conclusion, the actual life expectancy is lower than the lab result.
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