My laptop specs say :input 19V and 6.3A, That means (120W charger), I hve recently bought a charger because my old charger broke up. So this new charger provides 19.5V with 6.5A (126W) ; That are higher than the laptop's specs. Should i look for another charger that is compatible with my laptop 100% or i should not worry about this problem.
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Chahid talha
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Your laptop's specs translate to: "I need a charger with close to 19V, capable of supplying at least 6.3A. I will take less than 6.3A if my load is low, but never more than 6.3A."
This is perfectly fulfilled by your replacement charger, so you are fine.
Rule of thumb:
- Voltage +/- 5%
- Amperage: -0%, +infinity%
EDIT
There seems to be a discussion about the overvoltage question going on in the comments - let me clarify:
No charger in the world will give a 0.000000% tolerance on the stated voltage, e.g. my HP-branded laptop charger produces between 18.4 (highest load) and 20.9 Volts (idle) while specified for 19.4 Volts. I found this out, while a checked a cheap chinese car charger and used a multimeter to compare it to the original charger.
This is why all devices (including laptops) are designed to handle a +/- tolerance on their respective stated input voltages. Laptops tend to have a very high tolerance, as they have switching power circuits inside them to cater for the many different voltages a laptop internally uses (From ca. 1.4 Volts to ca. 14 Volts)
This implies, that a charger with a small (5%) difference on the nominal voltage is very unlikely to do any harm to the device. And i did call it a rule of thumb because no universal hard limits can be given.
Eugen Rieck
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