hp dv7t 4000 i7 series power supply backwards compat/safe to use on dv7t dual cores?

We have newer dv7t-4000 series laptops, with the i7 1.86 ghz processors.. they use the power supply 609941-001, which is 120 watt, 6.5 amp, 18.5 volt..

We also have older 2009 model dv7t's, which have the dual core processor and different power supply hp 463955-001, which is 90 watt, 4.74 amp and 19 volt..

If i plug the newer i7 power supply into the older dv7t laptop, it shows charging and even works without the battery..

My question is, does anyone know if this is truely safe to do long term.. are there internal circuitry protective measures in place to prevent damage and allow us to use the newer power supply..

You ask, why not just use the one that the older one came with, well, here at our business we have about 12 diff laptops roaming around, it would be nice in the large conference room to have 4 power supply blocks already in there, which will work with any of the laptops.

Thanks for any ideas here..

I tried the hp tech, they werent very technical, just said, they wouldnt recommend it.

 

DC volts, DC amps, the connector and polarity. These must match in order to use other power supply bricks.

If they don't, you are running a risk, however small, of killing both the power supply brick and the laptop itself.

remember that laptops (and most consumer electronics) are designed for mass production at the lowest price possible. to deliberately use a power supply that is not quite the exact spec and to expect that the internal components will take up the slack and provide protection for your choices is more than a little unreasonable.

A new power supply is less than $100-. A new laptop is $1000+.

Your choice.