Before resetting it, have you tried to simply reboot it?
The same thing happened to me once on my HD, it was discharging really fast even while sleeping. I just tried to stop/restart it (I generally always put it to sleep using the sleep cover) and the issue went away. I simply assumed that one of the processes went crazy, draining CPU time and preventing the system from sleeping. That's the only time I got this issue over a year of usage.
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