diablo7ize
New member
Hi, I'm from France so sorry for my bad english
I've had a gunai gn29 for 1 month, it's a ebike with 750 watts brushless motor and 48V battery. The first use I charged the bike normally the battery indicated 54.4v on the screen display. I was able to ride about 35 km on assistance 2 so 25km/h with a few climbs. After that, during a climb, the bike shut down completely, screen and battery, impossible to switch back on using the button on the display. I had to take the battery out and put it back in to turn the screen back on. The display shows 47 volts and when I'm on a climb I see the voltage drop to 37 volts and the bike shuts down completely. Same thing with assistance 4 and 5 on the flat when the battery gets to around 47 volts.
The second time, it happened after a 40 km ride.
What is the cause of the problem? what can I test to find out if it's the battery, controller or display?
Thank you

The second time, it happened after a 40 km ride.
What is the cause of the problem? what can I test to find out if it's the battery, controller or display?
Thank you