Originally posted by: MoMeanMugs
I guess I should explain a little further. That VR is going to be working harder dissipating heat.
No, certain types of electronics (linear regulators not present in this power supply stage(s)) would have higher heat but not in this situation.
Depending on what kind of safety factor was designed by the laptop manufacturer (he doesn't state which), that VR could be pumping out quite a bit of heat already. I'm not saying he's going to burn it up right away, but I've seen VR's speced for 15 V burn up at 13 V (on more than one occasion - supposed to be quality ones).
Certainly in different types of equipment with a different regulation type than seen in a notebook, a larger input voltage can exceed the thermal margins, as related to the amount of current the regulator is handling. It just isn't applicable in this case.
It should be noted that a voltage regulator is actually regulating current since it's a transistor. Now the stepdown transformer is going to be providing more current to the VR, and thus more heat.
With all due respect, you are thinking of a different circuit topology not applicable here. The laptop brick is a basic switching type that will actually be providing slightly less current at this barely higher voltage. At the laptop, on either a separate power regulation board or that circuit integral to the mainboard, there is switchign step down circuitry that has no significant difference in heat generation from this small difference in voltage, and will actually have slightly lower heat generation if anything due to shorter on-state. If there were a larger difference in voltage we might have concern about coming too near the ratings of some particularly susceptible (tantalum) capacitors, but this time the difference is so slight it's negligible. Plus, in the past few years manufacturers have started to shun tantalums in favor of other organic, MLC and other solid types - there may not be any tants in it at all.
I was never arguing that his battery or the motherboard itself would be damaged since it sits on the other side of the VR. However, I just don't like to risk things. We all know manufacturers cut corners to cut costs = cheap crap inside. I guess it all depends on how long he plans on using it. I'm not screaming impending doom, but rather issuing a word of caution.
From the details mentioned thus far there is no cause for concern. Edit: (Irrelevant content removed).
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In reply to the OP, so long as the replacement supply is of reasonable quality, meaning it is not some piece of junk more likely to fail (which we have no reason to believe, but there's a wide world full of all different quality goods out there) then it should work fine. The battery is not direct charged but rather through a regulation and control circuit. Someday your battery will die from aging as all do but it won't be from using an AC-DC supply that was 0.5V higher than the original, and as others mentioned the higher current rating is not only OK, it is often good to have a little more margin between the actual load and the peak rating of the supply, but for size and cost (profit) reasons the manufacturers only give you what you started with instead.
By my experience, his VR will not last as long. Look at the nature of the transformer in the power pack.
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