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-  Short press the button     battery power on 

(LED light turns off after 5 sec, but battery 

output is still standby)

-  Long press the button for 3 sec. (at LED light 

turn on condition)     battery power off

-  When switched on the power will continue 

12hours (output standby status)

-  After 12 hours without output, the battery 

power will totally turns off (No matter the 

battery is on or out of the bike)

Inserting  the  Battery

2.Slide  the  battery  along      

the  battery  rack

1.  Insert  the  key  and  

switch  it  to  unlocked

3.  Make  sure  that  the  

battery  slide  to  the  

bottom  and  fit  in  the  

controller

4.S

witch  the  key  to  

lock  the  battery

Inserting  the  Battery

2.Slide  the  battery  along      

the  battery  rack

1.  Insert  the  key  and  

switch  it  to  unlocked

3.  Make  sure  that  the  

battery  slide  to  the  

bottom  and  fit  in  the  

controller

4.S

witch  the  key  to  

lock  the  battery

Inserting  the  Battery

2.Slide  the  battery  along      

the  battery  rack

1.  Insert  the  key  and  

switch  it  to  unlocked

3.  Make  sure  that  the  

battery  slide  to  the  

bottom  and  fit  in  the  

controller

4.S

witch  the  key  to  

lock  the  battery

Inserting  the  Battery

2.Slide  the  battery  along      

the  battery  rack

1.  Insert  the  key  and  

switch  it  to  unlocked

3.  Make  sure  that  the  

battery  slide  to  the  

bottom  and  fit  in  the  

controller

4.S

witch  the  key  to  

lock  the  battery

Switch Button

LED light shows five bars, each  

bar indicate 20% capacity

1.   Insert the key and 

switch it to unlocked

2.   Slide the battery 

along the battery rack

3.   Make sure that the 

battery slide to the 

bottom and fit in  

the controller

4.   Switch the key to  

lock the battery

Electrical System Technical Manual 

4

4

5

INSERTING THE BATTERY

BL21 WITH SWITCH BUTTON

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