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Long story short: I have to replace the charger AND battery on my ASUS U53F-BBL5 laptop due to a combination of lost original charger and Best Buy can't read a laptop's model number for the correct charger. Now, I already ordered a charger, but looking back I may have accidentally ordered for ASUS U52F rather than U53F. I still have the absolutely worthless battery and I already have the ordered charger. Charger says 19V, Battery says 14.4V. I do not have the money to order another charger. So what can I expect the charger to do to my battery, and how badly? I.e. will it shorten total life before the battery becomes useless, will it just shorten how long a full charge lasts, etc. and to what degree?

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    \$\begingroup\$ What do the power input specifications on the back of the laptop say? The charger doesn't connect to the battery, it connects to the laptop, so the battery's specifications are irrelevant. \$\endgroup\$ – David Schwartz Feb 20 '12 at 2:02
  • \$\begingroup\$ I can't find any such thing. However, I am seeing some difference b/t battery and laptop's model numbers (odd since I bought this new). Battery says A42-U53f, laptop says U52f. Anyway, is there anywhere to check the laptop's input from windows? \$\endgroup\$ – Reaga Feb 20 '12 at 2:10
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    \$\begingroup\$ No. It's usually on a sticker on the back. It'll say something like "13V 6A". There's usually a little picture of a DC input jack. It may also have an icon indicating that the center is positive. This is the best image I could find of what it might look like. \$\endgroup\$ – David Schwartz Feb 20 '12 at 2:22
  • \$\begingroup\$ I'm going to blame a sticker-peeling friend of mine. It's not there. All I can find is the battery and charger information on the respective devices. \$\endgroup\$ – Reaga Feb 20 '12 at 2:38
  • \$\begingroup\$ I believe your laptop requires a 19V, 3.15A (or greater) charger. If not, it's 19V, 4.75A (or greater). \$\endgroup\$ – David Schwartz Feb 20 '12 at 2:43
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The wall adapter probably doesn't connect directly to the battery. There will be a battery charger circuit inside the laptop that decides whether and how to charge the battery. Most likely it's (partly) a switching regulator that needs an input higher than its output and thus the wall adapter voltage will always be higher than the highest voltage the battery can reach while charging. You shouldn't expect the voltage spec on the adapter and battery to be the same.

The battery charger circuit inside the laptop will need the correct input to function properly, but it's possible the manufacturer designed the laptop to accept more than one of its own wall adapter models. The battery may charge faster with a higher-powered model (more current capability) and slower with a lower-powered one. One would hope the vendor designed its own laptops to accept input from all of its own wall adapters with a plug that fits (otherwise they'd have put a different plug on the adapter to avoid confusion, circuit damage, lawsuits etc.). It would be best to ask the manufacturer directly.

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