Why do batteries lose charge even when not in use?
Quick Answer
Batteries slowly lose charge because internal chemical reactions continue even at rest. This self-discharge happens in nearly all battery types and is faster in some chemistries than others.
The Full Story
A battery stores energy through chemical reactions, but those reactions do not stop completely when the battery is idle. Small internal side reactions gradually consume reactants and lower the battery’s voltage, a process called self-discharge. Temperature, battery chemistry and age all affect how fast this happens, which is why some batteries sit charged for months while others drain more quickly. Rechargeable lithium-ion batteries generally self-discharge more slowly than older nickel-based types, though they still lose some charge over time.
Key Facts
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