Honda 150a 0-400v Fuse with Manual Disconnect
These parts usually sell for hundreds, fortunately we are Battery Hookup and not Battery Ripoff. These came out of new Honda hybrid lithium battery packs. The manual disconnect is simple, push the red button down and flip the lever to the on position to turn on the circuit. Flip the switch to the off position to turn off the circuit. You have to always press the red button down to flip the circuit back on.
You can run this in line with your battery pack on the negative or the positive side and simply flip the circuit on and off manually or leave it on and you'll get the protection from the 150a fuse. This is a top of the line industrial and automotive grade fuse.