Laptop will not charge my new battery. computer will operate off battery but won't charge.why?

Try remove the battery and charger/ac adapter/power cord from your Gateway NV54 laptop, press and hold the power button for 20 seconds to discharge any residual current inside the laptop. This clears your RAM and is like a hardware reset. Replace the battery and charger/ac adapter/power cord and turn your laptop on.

Check if it's something to do with your laptop power cord or power source problem. Insufficient power might cause some of those issues. Take the battery out and power on your Gateway NV54 laptop with the charger only.

Make sure your laptop power jack and charger plug tip are securely connected. If power jack is loosing you can find laptop power jack on ebay. However, fixing and soldering the power jack requires professional skill.

Also make sure the green/blue LED on charger needs to be constantly on without blinking. If not, replace the defective charger. You may consider getting a charger from company like topmic.com.

They are few of online stores I know who offer a charger under lifetime warranty. Since battery/ ac adapter won't last forever, lifetime coverage can help you save some money. Wish the Best.

The transformer in your computer probably needs to be replaced.

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