Macbook pro power failure

Hi.
Just recently my macbook pro has started shutting itself down once the battery level has reached about 25%. This is really annoying as anything I've been working on is not saved. Anyone got any iceas why this is happening. The laptop is about 16 months old and gone through about 285 charging cycles. Does it need a new battery already?? If so any idea how much they cost?
Iain

Iain ~ See this Apple doc. It mentions one of the symptoms: +"Battery exhibits low charge capacity/runtime when using a fully charged battery with a battery cycle count of less than 300."+
Looks like they cost 99 pounds here.
Until you resolve the problem, this free SlimBatteryMonitor can be configured to display a power warning panel when the battery level reaches a certain percentage. You can also configure its menu bar icon to change to a red colour when your battery's charge drops below a certain percentage.

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