Guide for replacing the battery for the MV Agusta F3 675/800 ABS. Obtain a wide flat screwdriver, Allen keys with handles (one 2.5, one 4, and one 5), a traditional 4mm Allen key, a 4mm Allen insert with ratchet, a 10mm fixed star spanner, a wooden stick 30/35cm long wrapped in two cloths, and a microfiber cloth. Position the bike on the rear stand. Using the ignition key, first remove the passenger seat, then with the flat screwdriver, unscrew the fixing screw of the rider's seat and slide it forward. Remove the tank side panels by lifting the rear part and sliding them forward. Using the 4mm Allen key, remove the screws from the under-tail, first the lower ones with a traditional spanner, then the upper ones. Unscrew the two screws with the 2.5mm key that hold the triangle at the tip of the under-tail. Now you can separate the under-tail into two parts and also slide out the under-tail. Remove the screws of the steering damper fixed under the steering plate using the ratchet and the 4mm Allen insert. Also, unscrew the two screws on the front plate of the tank. Remove the side support plates of the tank by unscrewing the three screws on them. Also, unscrew the rear fixing screw of the tank. Now carefully slide out the tank breather hose. Place the microfiber cloth on the front of the tank and lift it until the hoses allow. Place the wooden stick as support under the tank. Now you will have a complete view of the battery compartment. Remove the rubber strap of the battery and first disconnect the negative terminal. Install the new battery. Reassemble the under-tail first, then reposition the tank hoses as originally. You can reassemble everything as it was disassembled.