Give it an On/Off shield which drains all of it own energy output, and use it to charge up to a defended base for a self-d..... WIN WIN WIN.
-or-
Speed boost at a high energy cost which initiates the countdown, which cant turn it off. Make it a one shot wonder or an epic lol fail on the players part.
-Also-
It looks like shit

___________________________________________________________________________________
It seems odd to me that the thing is mobile but dies all to easy. Just seems like it could be more fun to use it as a giant roach or something. Atm it only seems to be able to CRAWL out of the way of a failing base then self-d'd when its cornered or something.
Can you make it more fun plz?