Samsung S duos - showing charging symbol but percentage not increasing I have samsung s duos. Suddently one day, when i was charging .. though the indicator shows charging, the battery level keep going down.
I restarted mobile... still same issue.

Then i tried with another charger, and there it was ok.
Note: The first charger is a smiley data charging cable connected to Laptop.
This charger i was using never, had this problem earlier. Is this OK ?
The charger will show as connected because the cable is making contact with the charging port, regardless of actually charging.

Yes chargers do go bad, usually at inopportune moments and there is a long list of reasons why. Sometimes from being plugged into long, getting dropped, getting too hot, used with wrong devices, being improperly pulled out from the wall, the charge connector getting bent in the charging port, etc.

When acquiring another charger, check a few things. 


Is the charger OEM (recommended, although aftermarket's will work)
Does the charger have proper charging connector (miniUSB, microUSB, male plug, female plug, etc.)
Will the power output match the requirement of your device (voltage &amp; amperage must be correct)
Is the charging cable long enough (for convenience).