¶ How to use your BMS Balance Tool
This guide is to detail how to use the FloatFab BMS Tool or Floatwheel OEM Tool
Pictured: Floatwheel OEM Tool left, FloatFab BMS Tool right
If you would rather a video guide click through to the FloatFab BMS video
You will need to download the JK BMS app for your phone to connect to the BMS
The JK BMS used in these BMS tools needs a voltage differential between the charger and battery to boot
The easiest way to to do this is to drain the battery to below 82v
Otherwise users have reported success booting by disconnecting the red wire connecting the battery to the ESC in the front box
Begin by opening up the battery box in the rear of your board
General rule of thumb working with batteries and BMS systems:
Balance cable should be the first to disconnect and last to connect
¶ Disconnect the balance ribbon
Start by removing any tape or glue covering the connector flipping up the tab and sliding the ribbon in a straight line out the back of the connector on the battery
I recommend taping over the connectors of the ribbon cable as it can be liable to spring into the battery connector and create a short between two pins
¶ Disconnect the negative lead
Disconnect the connector on the black cable between the battery and BMS
Tip: This can be easier to do if you slightly lift the battery out of the box
These connectors can sometimes be challenging to disconnect, I have found that twisting the two halves of the connector back and forth while pulling is a good process that can be done with fingertips.
I would recommend against using pliers or anything metal to pry the connectors apart
¶ Connect negative lead from BMS Tool to battery
¶ Connect ribbon cable from BMS Tool to battery
Inserting the ribbon cable can be finicky, take care to align it straight and along the guiding channel of the connector, it should not take force to insert it in the connector
One quirk that I fight with often is the ribbon catching on the lip on the front of the connector from not holding it too low
Take your time and use extra light during this step makes it easier to insert without any trouble
¶ Connect BMS Tool to power supply
It should only take a few seconds to boot as signified by a triple beep from the device, then disconnect from the power supply
As the Tool is only connected to the negative terminal of the battery I would not reccomend attempting to charge the battery through the BMS Tool
¶ Connect to BMS Tool through app
If requested to enter pairing password enter float
Devices not sourced from FloatFab may require a different password; 1234 or 123456 tend to be the device defaults
Note: This password field does not like it if you use the numbers above the letter keys as shown in the below screenshot
¶ Wait for BMS Tool to balance
The BMS Tool will stop balancing when the Cell Voltage Difference is less than 0.01V; at that point your battery would be considered balanced
¶ Disconnect BMS Tool
Disconnect the ribbon cable first, then disconnect the negative battery lead
I recommend taping over the contacts of the ribbon cable and securing it to the body of the BMS Tool to protect it from damage when not in use
¶ Reconnect battery to board BMS
Black negative connector first
Balance ribbon second, taking the same care and precaution as when connecting the ribbon to the BMS tool
¶ Finish up
I recommend taping over the battery connector to help secure the connector flap and ribbon cable
Have fun riding with the confidence that your battery cells are in balance
Still take caution when riding at low voltages as voltage sag still affects the boards ability to perform
For extra piece of mind use the BMS Tool again in a few weeks or months if your battery is no longer in balance there may be an issue with the BMS in your board
