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Question: If I overcharge my laptop battery, will the life span decrease?

Answer:

Overcharge does affect battery life span, it will hurt battery and decrease battery life, so all Li-Ion battery has controller chips to prevent if from overcharge.

A Lithium-ion battery may be damaged by extensive overcharging (continuously on a charger for more than 24 hours). Damage to the battery from overcharging would only occur in the very unlikely event of a malfunction of the charging system.