12v 7AH lead acid+arduino+motor driver =smoke WHAT HAPPENED?

cr0sh:

MarkT:
Looks like the heatsink on that board would be good for about 2W without a fan.

The L298 can also be configured in a bridged mode to give you 4A of current output into a single motor (you're gunna need a bigger boat - I mean heatsink).

Technically that's paralleled, not bridged... Its already a bridge!