Talk:Basic Importand Information of 65W Vs.90W Dell 310-7699 AC Adapter/@comment-219.134.39.193-20131114074721

There's more to this than 65W vs. 90W. If that had been the only difference, you would not be having a problem. In

selecting alaptop charger unit, you need to make sure several items match up:

1. Is the charger unit supplying AC or DC to the laptop? MUST be same as specified for the original charger.

2. Type of battery in the laptop. Many chargers are designed for a particular battery type and supply exactly the right

voltage and charging rate (current) for that. Some even are "programmed" to alter the charging rate depending on the state

of the battery's charge. All have a limit on the battery's maximum voltage to avoid over-charging. All of these are

important, and that's why using the wrong charger can cause trouble.

3. Polarity of the connector - MUST be the same as original.

4. Voltage MUST be the same.

5. Wattage MUST be at least as much as the original charger, can be higher without problems.

6. Max amps must be at least as much as the original, can be higher.

7. Connector on the end of the charger cord - must be the same size pins and spacing so that it fits the connector in your

laptop without damaging it.