User blog comment:Emptylord/Champion reworks/Blitzcrank the Great Steam Golem/@comment-26815373-20160520195714/@comment-3974211-20160520223545

The new innate was just reversing his current innate - so he's shielded based on the mana he's got left instead of his current mana. His current innate doesn't really make sense on a champion with a high cost primary ability and two spam able abilities - he wants to spend mana, but is punished because his shield is weak if he has no mana.

I chose the name "Mana Battery" because it's a recharagable power source.