It should be a more powerful bash doing more damage and more range. But at of the cost of using all the shields energy.
For example: A 5* shield does 21 damage in the ATH. With the charge it should deal around 31-42 damage in the ATH. (About 1.5x-2x damage)
In addition the range will be 1.5x the range as the normal bash.
Im guessing 7-8 squares for the normal bash. So, at 1.5x it will be 10.5-12 squares for the charge.
To use the Charged Bash: Players must hold down the Shield Bash for 1-2 seconds longer.
Also, Lets keep the Chaos set NOT buffing the damage in the Shield Bash. (bug)
All of which are Debatable.
talking about charge the shield bash:
the damage of the shield bash come to unfreeze the opponents, not exactly to "kill"
by that way... sounds better increase the stun effect by one level and the reach, if you wish charge
about me, i start using the shield bash to try corner the monsters (especially fiends), making easier opponents