it would be unfair for a player with a slow internet connection or power cuts, for example, could be any such problems. So your suggested system will eventually punish an innocent Tanki player.

in overdrive after the recharge 1. Teammates generally wait (or write 100 in team chat for others to know) and then use it to for their team benefit. 2. use it all alone finish first in the game. in addition to the power-ups it could also produce a shock wave (to a limited range) that could easily imbalance or turn hulls like wasp and hornet but it could also deviate the aiming of other enemy tanks near it..( could be useful in CTF and deathmatches)