Lap top battery problem.
I'm having a bit of a problem with my lap-top at the moment, the battery doesn't seem to hold any charge at all.
When using the external power supply it seems to charge fine and according to the power meter the battery's health is 100%.
The laptop is a Sony Vaio with a 650 PIII chip. It is a couple of years old, but there seemed to be no deterioration, rather the problem being thatas soon as you boot it up the charge immediately falls to zero and it powers down. (The battery is Li-ion)
Are there any tests I can do (multimeter across the terminsl?) or do I just need to accept defeat and buy a new battery (seriously expensive!)
Thanks for your help in advance