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18.5v 3.5A vs 19v 4.75A - Can I Use it?

post #1 of 6
Thread Starter 
Laptop charger broke. Original is 18.5v 3.5A = 65W

Have a spare one, 19v 4.75A = 90W

Can I use it? Is the voltage difference low enough (0.5v) and does higher amperage matter? (doesn't the unit just pull what it needs?)
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post #2 of 6
Sounds fine to me. Like you said the voltage isn't too far off, and the Amperage is simply the max it can pull. You can try it and I'm sure if it won't work it'll simply refuse to charge rather than actually messing anything up; I could be wrong but don't modern laptops and chargers have protection circuits?
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post #3 of 6
I wouldn't do it.

I have toasted a Linksys router pretty quick off a .5v difference in adapter.

Voltage has to be the same, Amperage can be more but not less.
    
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post #4 of 6
I wouldnt do it either, the amerage being higher is fine but i wouldnt want to chance the voltage difference
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by trueg50;15175275 
I wouldn't do it.

I have toasted a Linksys router pretty quick off a .5v difference in adapter.

Voltage has to be the same, Amperage can be more but not less.

Well.. It's been charging for 2 hours now.. No flames or explosions just yet.

As far as my reasoning goes, that Linksis router doesn't have VRM to compensate for the .5v offset.. The lappy is supposed to have, since the battery itself is 12v, so it doesn't feed the 19v from the charger directly to the hardware inside...

I guess.. confused.gif
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My Rig
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Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
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Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
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post #6 of 6
Thread Starter 
For anyone else wondering about running +0.5v charger - the laptop overheats after 3-4 hours of charging, so don't use it.

Mine still works, gladly, so now I'll be looking for a replacement with exact specs smile.gif
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MouseAudio
Logitech G402 Sony MDR XD150 
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Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
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Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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My Rig
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Ex-wife's Rig
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 4460 AsRock H81M-DG4 Sapphire Rx470 Platinum KVR 1600 16Gb 
Hard DriveHard DriveCoolingOS
2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
MonitorKeyboardPowerCase
Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
MouseAudio
Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
OSMonitorKeyboardPower
Windows 7 Pro x64 Toshiba 32" FullHD TV Logitech FSP Hexa 550 
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Overclock.net › Forums › Mobile Computing Forum › Laptops and Netbooks › 18.5v 3.5A vs 19v 4.75A - Can I Use it?