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Dell c640 laptop battery

Need to replenish the battery and can't recall how to do it. I know your suppose to let the battery run low and turn off and then recharge is this correct.

Posted by romeluss on

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Normally that is the best way. Turn your system on and let it run down without the power cord. It will shutdown automatically when the battery is really low. Then with the system off, connect the power cord and let the battery recharge. I'd let give it at least a 10 hour charge if not overnight. Should be OK by then. When you power back up the next day, look for the "icon" that lets you check power levels. That little program should tell you loads of information that you might find useful. Look for "hints' that will extend your battery life too. The newer batteries today no longer have that "Memory Issue" they once had. Just remember re-chargeable batteries do wear out over time. You can only recharge them so many times but that's now in the hundreds with the newer ones or around 2-3 years depending on usage.

Posted on Aug 26, 2007

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Battery displays all green when i push test button but wont run w/o a/c power

the battery has aged and its capacity is practically gone: even when it's fully charged the charge is so low that it can't keep the laptop operational. Time for a new battery.

Dell c640 laptop when not power on when using ac

The battery has a dry cell causing this so replace the battery

No AC, battery only, works in Dock

Try using the A/C adapter without the battery connected and see if your unit boots.
If it does, you will need a new battery, if it does not, question: do you see the led light up when you plug in the charger adapter ?
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New battery and still won't charge.

first, check that the battery connection isn't blocked by a sticker or something.
second: try disconnecting the battery and ac and hold the power button for 1 minute. then give the battery and ac another try.

let us know how it goes.

if it still doesn't work, time for a warranty replacement.

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The small one inside is for saving the BIOS data and the Internal Clock as just like in a regular desktop. That shouldnt need replacing unless its just very old. But even if the internal battery goes bad, it should still charge and work.

If the charge light isnt comming on, then its most likely the mother board went bad or the battery. Power it on and when in windows, right click on the desktop, click Properties.

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