Low voltage cutoff switch design help

I need to design a very simple circuit that will cut off power from a battery when it reaches 11V.

Basically its a rechargeable 12V battery that will be cycles repeatedly, but I want it to cut power to the electronics when it reaches 11V so as not to damage the battery.

I can find 11V Zeners which would work well but they are only 300mA and I need 3A rating.
Any ideas?

Use the low amp zener to control a relay coil. Voltage Drops, relay opens...use the NO contacts.