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The Science, Simplified
Why "2 to 5 years" is the wrong way to think about it
The industry doesn't measure battery life by the calendar — it measures it in charge cycles. A standard laptop battery is rated for roughly 300 to 1,000 full cycles before its capacity drops below 80% of factory condition. Once a battery crosses that threshold, a laptop that used to run for 10 hours might start capping out closer to 6.
Here's the part most people miss: a charge cycle doesn't need to happen in one sitting. It's cumulative.
Worked Example
What actually counts as "one cycle"
Monday
100% → 50%
+
Tuesday
100% → 50%
=
Combined
1 full cycle
Draining half the battery two days in a row adds up to exactly one full cycle — not two. This is why battery wear sneaks up on people: it's counting your total usage, not how many times you've plugged in.