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Sony VGN-SZ640 Power Adapter
If your decision is to purchase a different brand charger, make sure to check both the voltage and amperage output. When choosing a new charger, the actual Sony brand is usually going to be the safest choice. The Sony VGN-SZ640 power adapter provides two functions, to charge the onboard battery and powering the laptop. Because Sony has been known to use a single AC adapter that can be used on other units, be sure you choose the right one. A universal AC adapter is another possibility if you are desperate.
Some warnings of a bad AC adapter
- Battery does not charge every time
- The laptop does not run without the battery installed
- Most Sony AC adapters will get warm to the touch when plugged in for any length of time
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