Mana Battery
A charge is gained every time a nearby enemy casts a spell. When activated, all charges are removed, restoring 15 health and mana per charge.
Value 210
Aura Effects
+1 charge everytime an enemy hero in range casts a spell.
Radius 1600 Enemy Heroes
Activation
Self
Cooldown 17 seconds
Restores 12 health and mana per charge
Maximum of 10 charges.

this is almost the eact same as the power supply. i used one in a game as nymphora with a bottle and i never had to go to base.
IMO even better on tanks that are always in the thick of it. 150 hp for this or 225 on power suppy can make a big difference early game
i see what you are saying FallenDevil. I am more of a tank person and since tanks are in the middle of the combat you get more spells casted on.
linken sphere..
This is not linken sphere. This is magic stick in DotA
question:
if you have two “mana battery”
does one enemy spell then make two counters?
Tabaloo Keka