LA-D661P acer es1-524-224t battery blinking

[opethfan]

Hi
i have these problems:
- when plugged power supply, the laptop's orange led starts blinking
- the battery won't charge
- the voltages on the battery contacts without the battery plugges are around 3 volts
- the laptop is working good but it won't see the audio device

someone has same experience?
thanks