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For the last few years most Lithium batteries have been rated for 500+ discharge/recharge cycles. The thing is that to get the "+" part mostly requires shallower discharge cycles and recharge cycles slow enough to limit heating to a minimum. Now, that's not to say your battery will only last 500 cycles, or that capacity will remain anywhere near 100%, but as low as 80% usually makes very little difference for most applications... With shallower discharges one might get nearer 1000 cycles, but overall still probably only ever draw the same amount of power, or a bit more, from the battery over time.
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