can 19 volt 4.7 amp power supply replace 19 volt 7.7 amp

January 1, 2016 at 16:25:23
Specs: Windows 7
Old use-able Sony Laptop uses "heavy" 19 volt 7.7 amp output.
Can I replace it with a 19 volt 4.7 amp output with same pin size?
I am guessing it will just take longer to charge the battery?

See More: can 19 volt 4.7 amp power supply replace 19 volt 7.7 amp

Report •

January 1, 2016 at 16:40:39
If 7.7 amp was specified for the laptop (model number not given) then that's what it needs. The important factor is what current the "laptop itself" consumes. Using a lower ampere rating could cause the output voltage to fall and possibly damage the charger. As you say, the charging would take longer also.

Always pop back and let us know the outcome - thanks

Report •

January 1, 2016 at 16:59:39
Thanks, good answer. Just tired of the extra weight of the heavy charger when traveling. The 4.7 amp charger weighs 2# less.

As I have been using a variety of cell phone and Bluetooth chargers interchangeably with different amp outputs, the only thing noticed is a longer charging cycle when using a low output Bluetooth charger.

Report •

January 1, 2016 at 17:16:04
Your laptop may run on the lighter charger but not charge the battery at the same time.
If turn off the laptop it will charge as expected.

Cell phones will charge and run at PC-USB-level 500mA. More Amperes (AC chargers are usually 1 Amp) will charge faster. (IPhone 6 excluded)

Tablets may not charge while powered on at PC-USB-level. The 500mA is not enough to charge the battery when the tablet is on.

Report •

Related Solutions

January 1, 2016 at 22:40:09
If you're mixing chargers--possibly from different manufacturers--make sure the polarity is the same. Each should show the same polarity symbol:

If one shows positive polarity and the other negative then don't don't connect them.

Report •

January 2, 2016 at 03:46:41
Hi Voice, you advise the Sony (what model?) is old.

Because of this, I wondered if the 7.7 amp psu is original, and if NOT, could it be a higher amperage than the original psu.

On the laptop, may be a label providing details of the required psu rating.

It is never a problem if a replacement psu has the same voltage and the same or higher amps than the original. (same with the battery). Although for the battery, it is my opinion it is unwise to have more or less cells than the original (generally 6).

There could be a (serious) problem should an incorrect voltage be supplied and/or lower amps than the original.

Possibly a modern light weight psu can be found with the correct rating for your laptop.

Good Luck - Keep us posted,


message edited by Mike Newcomb

Report •

January 2, 2016 at 08:18:27
Did not expect this many great replies to my first query on this site.
Thanks everyone.

Report •

Ask Question