replacing PSU with higher amped one good or bad idea

crooked windows · Aug 6, 2015

The power brick died and I can replace with an identical or 50% higher rated current one. Is this better as it won't run as hot under load?
Old psu used to get hot to the touch (could hold without dropping) when the notebook was recharging the battery and work on it . My power setting is set at PERFORMANCE 90% of the time. so using a beefier psu will hopefully keep the units life expectancy longer and cooler ? yes ?
This theory runs OK for a desk top so why is this not good for a notebook or is it?
old converter / power supply is 19v 90W (4.74A) and can upgrade to a 90W 19V 135W (7.11A) unit

gilbadon · Aug 6, 2015

It should work fine. The PC will only draw as much current as it needs. There should be current limiting hardware on the laptop itself. Typically the manufacturer picks a charger for a reason though. The new one will not run cooler but it may reduce battery life of your current battery or have other negative unforeseen effects.

crooked windows · Aug 6, 2015

As you point out there is hardware controlling current flow but don't see why it will affect battery life negatively (not a pun). Pushing the PSU to the max affects only itself as resistance goes up – heats more – more resistance etc… . My thought is the 135 amp is better specked and even if it does run at same temp as old one, at least the components can cope better. This bigger HP 19v brick is their answer to one psu covers all their power notebooks so being HP and using it on one of their notebooks should be fine. The reason I asked here is the wisdom over sales talk which I appreciate very much. I have asked a certified HP repair center and they said not recommended (?) but they weren’t actually sure, I didn’t expect that. The positive outcome to the brick failure (first out to fail out of 4 notebooks, all 2nd hand) I get to use my ol Compaq v3000 

jarotech · Aug 6, 2015

Hi, if you have the same size connector with the new adapter, I see no reason to use a higher amperage. You have the same voltage and hope the same polarity, the laptop will use the amount of current it needs.

gilbadon · Aug 7, 2015

I just said it may have negative effects. It should be fine. Some laptops will source more current than they should, making the battery charge faster than it was meant to, which in turn will have negative effects to battery life. It depends on quality and design of the charging system. Chances are, nothing will happen at all with the higher current charger. Not even HP will know what they did (even a lot of HP engineers do not know). It is safest to stick with what it came with.

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replacing PSU with higher amped one good or bad idea

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