is my battery knackered??

[gordies]

report from about this mac :-


Battery Information:

Model Information:
Serial Number: Sony-ASMB012-34b7-273a
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0003
PCB Lot Code: 0000
Firmware Version: 102a
Hardware Revision: 0400
Cell Revision: 0303
Charge Information:
Charge remaining (mAh): 900
Fully charged: No
Charging: No
Full charge capacity (mAh): 1010
Health Information:
Cycle count: 599
Condition: Good
Battery Installed: Yes
Amperage (mA): -3
Voltage (mV): 12116


this battery is not holding charge and sometimes refuses to recharge, status showing as : not charging.

is it time to bin it or should i claim a replacement?

thanks, Gordie