The batteries are terrible on the 6400. I hardly ever use it on battery, but my first battery died after only about 12 hours (really) use. The backup battery is failing now. It says it's fully charged when I check, but the power disappears after about five minutes of use.
The Dell forums show this is a common problem but Dell hasn't issued a battery recall or a fix. The batteries aren't covered, even though they are hardly ever used, and as far as I know, there's no way to know how much they've been used.
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Re: Blinking red light
blinking red light with battery icon means that you are running out of battery power. if the computer is plugged in to the wall and it still does the same thing you may have to replace the ac adapter or charger. the charger should have a green light on it to indicate it is getting power.
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The majority of laptops will display a solid green, blue or
purple battery light to indicate that the battery is fully charged. Most
manufacturers indicate that a laptop is in the process of charging by
displaying a solid or blinking green, orange, blue or purple light. If
your battery indicator light is green, blue or purple, the battery is
probably functional, regardless of whether the light is blinking. If the
light is solid orange, the laptop is probably in the process of
Battery Error Coneventions
Many battery manufacturers use rapidly blinking lights to
indicate that a battery's charge level is low. In general, a laptop will
rapidly blink orange or red when its charge drops below a certain level
until the computer is plugged into a power outlet and charged. If your
laptop's battery indicator continues to blink rapidly in orange or red
or if it remains red even when it is plugged into the charger, it
indicates a problem with your battery or the charger.
This usually means that your battery is not charging. Take the battery out and turn the computer on, plugged in only. Shut the computer down and then replace the battery. If the led light is still blinking red, it is time for a new battery. You can find a replacement battery on eBay for a reasonable price.
When the 1,3, 5 lights are flashing when you press your battery test button, then it means your battery is dead and will not hold a charge. You can still use your PC on A/C power with no issues, but if you want to use it on battery power then you will need to purchase a new battery.
Hi, Here's one way to determine the problem. Take the battery out and try to boot on AC power only, if it boots turn it back off, reinsert the battery again and try to boot. Sometimes you just have to take the battery out and plug it back in again, with others it is the battery and you have to leave then out until a replacement is bought. If it still won't boot on AC only, remove and reinsert the memory, try to boot the computer and listen for any beeps. Post back if you need further assistance.
If the blinking light on a Dell is yellow or amber or orange (somewhere in that color range) and continues to blink the entire time it is plugged into AC power (wall outlet) and when you unplug it from the wall the laptop immediately dies .... then you battery is dead and needs replaced.
If the blinking light stops after a while (perhaps a minute?) and then turns green while plugged into AC power, then it is successfully charging - or so it thinks.
When you unplug it from the wall, does it stay up and running? If it runs, it's OK - just ignore the light and plan on getting a new battery one day, start browsing now. :) If it dies immediately upon unplugging, then your battery is dead and needs replaced.
What laptop brand and model is it? And where is the LED that blinks? Important details! Some laptops have a power light that blinks red while battery charges, then it turns steady green when battery is full. Some laptops have a red LED that lights whenever there is hard drive, CDrom, or floppy activity (read/write). This all depends on your laptop brand/model and where the LED is (side, near floppy/CD, top near screen, or on battery itself... so provide more details for me, please!