That’s a pre-Li-Ion battery “myth” as far as I know or perhaps more so a misunderstood term of “recharge cycle”.
As far as I know, the battery isnt really hurt depending how how often charging is iniated, but more so how long has it been charging or how many hours has it been charged during it’s life. In fact, Wikipedia for example says that the best way to preserve the battery’s long term life and capacity is rather to charge it more often in smaller increments rather than let it go low charge/empty. The most harmful thing to a Li-ion battery is let it go completely dry, the less you let it go to low capacity, the longer it’ll probably live.
The charging cycle probably actually refers more to a “unit of one full recharge”, as in having the phone charge for 5 minutes, then picking it up and putting back wouldnt count as “one charge cycle”, but more like going from near empty battery to full battery is a full cycle, regardless of how many times it stopped and started charging during that cycle.
It’s funny how deeply rooted many of the “battery myths” still are, despite most of the myths are tied to old forms of battery (like NimH) that arnt really used anymore. Like, for example if my parents buy a new phone, you can be sure they will keep the charger plugged in for over 24 hours before they start using it, cos that’s how you were supposed to do it when u bought a new Nokia phone for example like 15 years ago
You can read up on the topic for example here: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_…
As a rule of thumb, the best way to prolong the life of your battery, avoid full discharges and rather charge too often than too seldom. My N8 is over 2 years old now and I’ve always charged it every night regardless of what the battery meter shows and the battery is still doing just fine, naturally some reduced capacity can be observed compared to 2 years back, but the battery still lasts mostly the same as it used to.
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