Compaq Laptop Model: CQ60-615DX fully charged,

A microswitch at the connection (where cord connects to laptop) is failed - this will need to be replaced, unfortunately, this requires nearly full disassembly of the laptop to get to the connector, and the whole connector has to be replaced. On one (of two) motherboards used in this model, it will require part to be soldered to remove, and soldered back on... the other it's a smallish board that unplugs from the main board.

If you can reach inside the computer and rub the battery contacts gently to remove the corrosion ,which is invisible , this will help greatly. Sometimes even a new battery will suffer the same. Clean the battery contacts also turn off the laptop and charge it fully do this on a regular basis. Say once every 2 months

Power pins on the socket maybe broken.

If the battery fully charges and lasts in normal use without the charger plugged into the laptop, then this clearly indicates a problem with the charge circuits in the computer, unfortunately this is built into the motherboard.

Will the old battery (that you are replacing) charge up at all? If the old battery charges but the new battery will not, then it's likely a bad replacement battery.

To rule out the possibility of a corrupted battery meter inside of windows, you may wish to leave the laptop on battery power only, until it dies. A 5% charge will usually only grant you about 20 minutes of laptop life maximum. Since you left it charging all night, you should get a few hours of life before it dies. If you get a few hours of life, the battery meter software is corrupted.

Most likely though, the replacement battery is bad.

batteries have a charge memory in the, when you purchase a new battery the best thing to do is to fully drain the battery before charging it up, this will tell the battery that it needs full charge, if you charge the battery before this it will only charge the battery to a certain percentage.
what you need to do now is find a way to fully discharge the batteries

kind regards

Does it work with "no batteries" - only plugged into power source? check your usb cable by trying to power up something else.

Did you charge it for up to 8 hours?

Caring for your Compaq Evo N400c Laptop Battery You can improve the life of your Compaq Evo N400c Laptop Battery by doing the following:
When you first receive your laptop battery charge it fully for at least 6-8 hours and then discharge the battery fully by using your laptop unplugged from the mains until it runs down completely.

Repeat this 3 times to ensure your Compaq Evo N400c Laptop Battery will give you the maximum performance.

If you regularly use your Compaq Evo N400c Laptop on mains power for extended periods, removing the battery from your Laptop during these periods will extend the usable life of your laptop battery.

hi.. unfortunately i've seen many cases like this and it looks as if from what you are describing that your laptop is fried if there is no boot up at all.. how old is you laptop and what brand is it?

Chosenone, Even though the battery meter shows it fully charged I doubt it?s correct. Over time rechargeable batteries loose their ability to store power. How long depends on the battery manufacturer and how well you treat it but you can consider yourself fortunate if your battery lasts three or four years. Beware of people who suggest you take apart your batter to bypass the safeties or replace old battery cells. Defective or improperly handled batteries can overheat and cause fires when you least expect them. Let us know if you have any more questions and please don?t forget to rate this post.