T440s will not power on unless plugged in

My T440s will not power on unless the power adapter is plugged in.  Once it has powered on, I can unplug the power cable and it will stay on.
Needless to say, this is not an optimal situation for a laptop.
Please tell me there is a fix, and that it does not require shipping my laptop back to Lenovo again.
Thanks

So, I believe I have the same or similar problem. What I think is happening is the internal battery shuts off when the AC power is connected. However, it doesn't reactivate and when you try to power from battery it won't work.
These are two workarounds I have found that seem to work for me:
1. Unplug the laptop before you shutdown. This switches to battery mode and activates the internal battery.
2. Go into your BIOS and change your USB setting so that Always On is active when on battery. This will allow you to charge your phone or other device using the Always On USB and will keep the internal battery activated.
Hope these things help!

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