I'm on a T430s too and battery life is still quite good after nearly four years on the first one (I foolishly had it plugged in most of the time which has broug

I'm on a T430s too and battery life is still quite good after nearly four years on the first one (I foolishly had it plugged in most of the time which has brought the capacity down to about 80%). I gave it an additional battery in the Ultra Bay that extends overall battery life to over nearly 5 hours of light use under Linux.