My experience is that you need a new battery. They usually can handle so many cycles, and 2 years seems to be about it. However, chargers can go bad too. Closely inspect the charger wire for nicks and pulls, as these wires a quite fragile. If you have a voltage meter, check the output voltage.

I get about 2 years out of a phone, and the cost of replacing the battery is outweighed by just buying a new phone.

I agree with bricktop. But I just had the charger port on my phone die and refuse to recharge. Do you know anyone with the same or similar phone? Switch chargers and see who's phone goes dead. If not, vehicle chargers are dirt cheap here, and easier than reprogramming a new phone. Good luck.

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Regards !

My experience is that a single diode is being used in most of the chargers made in China or else-where.

Check the rectifier [a single diode or a bridge rectifier] for short-circuit. As if it is the secondary of transformer becomes the load for battery & will drain it.

Hope may be of any help.

Thanks for all your comments.

I think, even the European and American companies now do not hesitate to dump cheap and poor quality goods in the market to compete and make profit. We, the buyers can not rely only on the brand or company's name for quality of goods and service, as before.

I guess it is not worth trying to repair the charger. I think it is better to throw the problematic charger supplied by Sony Ericsson and buy a new one.

This is very strange,i agree to check the charger by a multimeter,see if the voltage is correct,and two years for the battery is a little long time,usually,when have used a battery for two years,the battery can not hold much charges.maybe you can buy a replacement battery,its very cheep and also buy a 4.2V li-ion travel charger.