Originally Posted by
Unknown Cyclist
It's going to depend on the type of charger and whether it has any protection built in.
It's probably best not to find out
The presense of an inline fuse leads me to believe that there is no protection. Good chargers have the outputs isolated until they sense a correct connection. The only reason for a fuse is to blow in the event of a reverse connection. The charger is current limited so shorting the outputs won't matter.
Originally Posted by
closetbiker
but the problem is, if I connect red to black and black to red, right?
That's right. If you hook it up like that you risk damaging both battery and charger.