Which Laptop Charger is More Efficient for a 65W Rated Laptop?

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Discussion Overview

The discussion revolves around the efficiency and suitability of two laptop chargers rated at different amperages (19V 2.64A and 19V 3.42A) for a laptop that requires 65W. Participants explore the implications of using chargers with different current ratings, particularly in relation to the laptop's power requirements and battery charging characteristics.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that one charger may work while the other could fail or pose a safety risk, particularly if the laptop draws more current than the charger is rated for.
  • There is a concern that using a charger rated below the laptop's power requirements could lead to damage, as it may not handle the load effectively over time.
  • One participant notes that the suitability of a charger depends on its characteristics and the specific requirements of the laptop's battery, suggesting that a larger charger may charge faster.
  • Another participant emphasizes the distinction between a power supply that runs the laptop and charges the battery versus a dedicated battery charger, indicating that the laptop's power rating does not directly correlate with the charger's rating.

Areas of Agreement / Disagreement

Participants express differing views on the implications of using chargers with varying current ratings, with no consensus reached on which charger is definitively better or safer for the laptop in question.

Contextual Notes

Participants mention the potential for chargers to operate above their rated current, which could lead to failure, but do not provide a clear resolution on the best choice of charger. The discussion also highlights the importance of understanding the specific charging requirements of lithium-ion batteries.

Who May Find This Useful

This discussion may be useful for individuals considering the purchase of a laptop charger, particularly those interested in the technical specifications and safety implications of using chargers with different power ratings.

selseg
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A laptop charger rated 19V 2.64A and another rated 19V 3.42A what advantages would one have over the other.If I am using it for a laptop rated 65W
 
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One will work, one won't, or will catch fire

65W is 19V at 3.4A
 
Potentially the 50W charger could be ruined. Your lap top may well be drawing more current then the rated power of the charger. It may work fine for short periods of time, but then it could also fail. Generally it is not a good idea to run power supplies at higher then rated currents.
 
You need the one which is suitable for the battery. Hard to say which one that would be. Depends on their characteristics . I thought Li-ion required constant current charging and the charger will produce that current and no more. The larger one will be faster. Depends on how good the lap top charge indicator is and I gather they are rather poor. I would have thought the best way to charge a Li-ion battery is externally with an good quality 'intelligent' charger with a timer.

The lap top power rating has no connection really with the charger rating.
 
The OP says laptop charger they probably mean the external power supply that runs the machine AND charges the battery rather than just a constant current battery charger.
 

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