I have a laptop battery that's at around 70% health, which means it doesn't fully charge to a hundred percent. So, I'm wondering if it still draws the same amount of power to get to this "full" 70%, compared to a new battery that charges to 100%. For example, if charging to a true 100% uses 5 watts, would the 70% battery still use 5 watts or would it be less, like 3.5 watts? Just to clarify, I'm assuming there's no overcharging happening here.
3 Answers
I’m no battery expert, but I think the resistance increases as batteries age. This might mean it takes a bit more power to charge an older battery, compared to a newer one.
It doesn’t change how much power your laptop consumes overall. A battery with 70% health will still draw the same power to charge as a fully healthy battery up to its maximum. Basically, the power needed to charge a battery isn’t simply about the capacity; it’s more about how batteries age and lose efficiency, but the same charging power applies up to the respective limits.
Let me give you an analogy: if you have a container with a capacity of 7 liters, it can’t hold 10 liters, right? So, if your battery only holds 70% of its original capacity, you can think of it as having less room to fill but the charging process might still work similarly up to its limits.
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