A 17% drop in capacity over 4 years is not an issue. Batteries have a useful life of 3 to 5 years depending on cycle count; if you get 1000 cycles, you've gotten the full life out of it. The
The key here is the number of cycles. It's important to note that it's not what you do, but how many times you charge the battery. It doesn't care that you're reading reddit, browsing with Chrome, or rendering video. What matters is how often your battery is drained and recharged.
Note: A cycle is one complete drain and recharge. If you drain only 5% and then recharge, it's only a 5% of one cycle; you have to do that 20 more times to to equal one whole charge cycle.
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