your laptop is more important than your charger. This is necessary to buy a good charger that can save your laptop and battery for long time.Higher voltage charger can harm laptop as well as Higher current charger can harm your laptop.
Lower voltage charger 10 create an internal resistance in your battery of your laptop that will decrease your battery life of your laptop.
so the good one to buy is Check your previous charger that has come with your new laptop.
The do following conclusion.
Match voltage range of output voltage like 19.5 volt
Match current range of output current like 2.5amp
If both of them is matching then this is best to buy one.
if you are buying this from online store Mast check the size of input pin.
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