You are going to need the following tools:

5/32 Size Allen Wrench
Backfire™ 180wh Battery

Link to buy a battery:

https://www.backfireboards.com/product/477325795200/BACKFIRE-180Wh-battery-pack-with-enclosure-and-charging-port

Step 1: Set Up Your Work Station

Place the Backfire G2 Skateboard upside down on a flat surface along with the Allen Wrench and the battery.

Step 2: Locate the Battery Casing

It will be the case on the bottom of the board that does not have a power button. It is the larger black case and has "BACKFIRE G2" written on it. The battery casing is pictured.

Step 3: Unscrew 3 Bolts on One Side of the Battery Casing

Use the Allen Wrench to unscrew three hex bolts on one side of the battery casing. Insert the wrench into the bolt and turn clockwise, Keep track of the washers that come out with the bolts.

Step 4: Unscrew the 3 Hex Bolts on the Other Side of the Battery Casing

Use the Allen Wrench to unscrew the three hex bolts on the other side of the battery casing. Line the bolts up with the same holes they came out of to ensure that they go back in easier (optional)

Step 5: Flip the Battery Casing Over

Take the side of the battery casing closest to the wheels and flip it over towards the other end of the board.

Step 6: Disconnect the Battery From the Deck

Disconnect the battery from the deck of the board by taking apart the yellow connector. Simply pull the sides away from each other. MAKE SURE YOU DO NOT PULL ON THE BLACK AND RED WIRES

Step 7: Disconnect the Battery From the Charging Port

Disconnect the battery from the charging port by taking apart the black connector. Push the button on the black connector and pull the connector apart. MAKE SURE YOU DO NOT PULL ON THE BLACK AND RED WIRES

Step 8: Remove the Battery Casing From the Deck

Remove the battery and the battery casing from the deck of the board and place it on a flat surface

Step 9: Remove the Battery From the Casing

Remove the battery from the battery casing by simply pulling it out. You may need to pull a little hard because of the adhesive strips.

Step 10: Place the Removed Battery on a Flat Surface

Place the removed battery on a flat surface with the adhesive (white strips) facing upwards

Step 11: Insert the New Battery Into the Battery Casing

Insert the new battery into the battery casing with the adhesive facing downward (Black side should be facing upwards).Be sure to press firmly. Make sure that none of the wires are stuck under the battery and make sure the wires are on the same side as the charger plug

Step 12: Place the Battery Casing Back on the Deck

Place the battery casing with the new battery back on the deck of the board. The battery casing should be placed in the same place it was in Step 5.

Step 13: Reconnect the Battery to the Charging Port

Reconnect the black connector. The black connector should easily slide back together.

Step 14: Reconnect the Battery to the Deck

Reconnect the yellow connector. The yellow connector should easily slide back together.

Step 15: Screw the Battery Casing Back Into the Deck

Flip the battery casing over and line the holes in the casing up with the holes on the deck of the board. Make sure all of the wires are under the battery casing

Then, Put the washers back onto the bolts. Next, use the Allen Wrench to screw the 6 hex bolts back into each side of the battery casing.

Make sure each bolt is tight goes completely into the casing. Make sure there no space between the battery casing and the deck of the board