Booting with a known good and fully-charged battery has worked for me in the past also. That got rid of the critical low-battery error without any further repercussions (I think it was a T23). If you still have issues or a re-occurrence after trying that then looks like you have further system power issues as mentioned in the discussion above.
240, 380Z, 390X, 570E, 600x, 701C("The ButterFly"), 770, A20...22,31, G40,41,
R32,40,50,51,52, R60,61, SL410/510,T20...23,30,40...43, T60p UXGA,T61,T400,
TransNote, X20..24,31,40,X41T,X60,61,X60/61T, Z61t, W500
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