Wiley_11
Well-known member
- May 10, 2011
- 1,325
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This isn't a fact, it's a falsehood that's been repeated so often, people believe it to be true... And one that's lead to the premature demise of many a battery. Some phones will turn off the charging circuit, but only temporarily until the phone drains the battery a bit, at which point it will start charging again.
Other phones will step the charging current way down in an attempt to create a situation where net discharge is 0%.
In both cases, they are still pushing current into battery that's either fully charged or damn near close. And this will cause premature wear on LiPo batteries.
"The question is asked, “Should I disconnect my laptop from the power grid when not in use?” Under normal circumstances this should not be necessary because charging stops when the Li-ion battery is full. A topping charge is only applied when the battery voltage drops to a certain level. Most users do not remove the AC power, and this practice is safe."
How to Prolong Lithium-based Batteries - Battery University
So according to B.U. your statement is false.
