Took my Inspire 1 out today and used up my T47 with no issues.  I turned off the Inspire 1, put the T48 in and as soon as I connected the battery the Inspire turned on, but the battery was off, and I have to pull the battery to turn the Inspire 1 off!?!
Last night I drained both batteries dead, then in the morning did a full charge on both.
Top light blinking (by the power button) 4 times with other 3 solid
Anyone know what is going on?

Unfortunate your battery got overdischarged. This is  a rear case. You will have to contact DJI or your dealer to get the replacement if it's still under warranty.