macbook late 2009 charges but mac says its isn't. It'll slow charge if on.

Ok this just started happing,it'll slowly charge while on.It charges while off,but this battery icon when i click on it'll say not charging.My charger doesnt show a light either. Here system info

Model Name: MacBook

Model Identifier: MacBook6,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2.26 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache: 3 MB

Memory: 4 GB

Bus Speed: 1.07 GHz

Boot ROM Version: MB61.00C8.B00

SMC Version (system): 1.51f53

Serial Number (system): W80090P28PX

Hardware UUID: CAA401D1-38C6-526F-9745-41BD53BBDD2D

Sudden Motion Sensor:

State: Enabled