Note: the screw near the charging port is different.
Remove the knob on the other side (the screw is under the cap)
Pull out the battery pack + fan + motor
Split motor and battery pack.
Note: take care of the clips.
Remove the LED module completely. Attention: the metal stripes are not attached well, take care when pulling off the cables.
Disassemble battery pack
Open the pack by pressing the 4 clips and pulling it apart
Cut off both wires to the battery pack, dispose the cells appropriately.
Keep the charging port :-)
Remove the plastic cell separators in the case
Adapt 18650 holders, assemble battery with BMS
A small note for this step:
I've tried around a few variants, so the wiring I show here is messy.
If you want to repeat this step, maybe you think of a way to do it much better. But I'm using the DustBuster for 6 weeks in this configuration and I'm satisfied:-).
Cut off the original thin wires from the battery holders
Attention. Don't mess up the polarity!!!
Note: the battery pack is not very "solder friendly". Heat up only a short time, and use an air filter!
Step by step connections:
Connect the charger port + to the BMS load +
Connect the charger port - to the BMS load -
Connect +/- from both battery holders
Connect +/- from the battery holders to the battery +/- from the BMS
Connect the motor +/- (upper and lower connector) to the BMS battery +/-. //I had the problem, that the BMS was triggered all the time by the inrush current of the motor. Although the continuous current was way below battery/BMS specs (around 8A).
Connect the balancing connection on the other side:
Both battery packs
"4.2V" label of the BMS
Inserting the batteries: You need 4 equally charged cells from the same type & age.
And now: try to fiddle everything into the case...
I've used double sided adhesive foam tape to keep the BMS isolated.
Put both sides of the battery case back together.
Please take care of the batteries: do not damage the cells in any way!