When a Li-Ion battery suddenly dies but is still recognised and showing some charge in the (Windows) battery status window it may have a small fuse blown. If you know about electronics you can open the pack carefully (be sure not to cause any shorts!). Find the wire coming from the positive terminal of the battery (normally it is a red wire) and check if the voltage is OK (each cell about 4V). Follow the wire to the printed circuit and you will find it connects to a small fuse (can be white). If the fuse is open you can replace it. (many are 9Amps). WARNING: this is a safety component which protects for shorts and for high temperatures. Just bridging it may cause fire in case of failure!
Battery is probably bad. Uses lithium-ion and every time your run the battery down to nothing, it shortens its life. Sometimes they ship defective and you'd need to contact the manufacturer to get a replacement.
SOURCE: asus a6 notebook charging
You may not let battery go total out of power. Charger do not can't start charging if battery is totally dead.
Solution: take 2 wires 10cm take Asus charger and put wire to + and another to - then take your laptop battery and other end of wire to + contact and another to -, plug in charger and let it be 10 seconds, after that take wires off and put battery to laptop and charger to laptop plug. Voila' now orange light is on and charging starts.
SOURCE: where is the wireless switch on the r503u notebook?
Have you tried your owners manual or this sire:http://support.asus.com/Troubleshooting/detail.aspx?SLanguage=en&p=3&m=R503U&s=410&hashedid=n/a&os=&no=1715. Sometimes you will find a help section on your laptop look for ASUS in all programs Help.
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