Macbook Pro Mid-2014 trackpad not working
I would remove the battery and rely on the power adapter. You can try resetting your SMC, this fixes a lot of hardware and power related issues.

◦   Shutdown the MacBook/Pro and remove the battery
◦   Disconnect the power adapter, hold the Power Key for 10 seconds
◦   Release the power key and reconnect your battery and power adapter
◦   Turn your Mac on
◦   Let boot as usual