Battery not working, No voltage out and battery LEDs always on

General
1

Hi,

I’m on 1.7.2 and can’t get any voltage to my cycle analyst.

The battery LEDs are constantly on and the battery won’t go to sleep. The app doesn’t show the top row where you selected controller type, cell type and configuration.

And checking with the multimeter, there’s no voltage coming out of the battery dock.

I have tried to reset it, but it continues happening. Every now and then, all the LEDs turn white and it restarts.

How can I fix this? It looks like the battery is stuck and the app doesn’t show all the options I had when I set it up. :melting_face:

2

Hello,

I haven’t seen this situation with this version of the FW.

You confirm the button on the support is “on” and that you have no voltage on the output ?

Does the battery goes to sleep when it is idle and not on the bike ?

After you reset the battery, it works again and then happens again ?

Can you share the bms id ?

If the BMS is faulty, i will send you a replacement

3

I’m writting a check procedure here to dertermine if the BMS is faulty:

Here are the check you should do if your BMS doesn’t output any voltage.

  • while the battery is on the support, does the output voltage changes when you press on the on/off button on the support ?

  • if no then, remove the battery of the support and measure the voltage between + and - while connecting the VD (Vehicle detect pin) to -. if this works (meaning you measure a voltage higher than 32V) then the support seams faulty. If not then go deaper on the BMS analysis.

Screenshot 2025-09-16 at 12.13.32
Screenshot 2025-09-16 at 12.13.321116×862 57.4 KB

  • with the BMS plugged to the pack, check again the previous test after having reboot the BMS (white button that should reboot the battery).
  • with the BMS plugged to the pack, measure the voltage between the two red circles and the green circle. It should be the same and steady (above 32V). If not then the fuse (white part between the red circles) seems to have triggered.
  • with the BMS plugged to the pack, measure the voltage between the capacitor pad that is circled in blue and the green circle. It should be about 5V. If not then the power supply seems dead

Screenshot 2025-09-16 at 14.37.19
Screenshot 2025-09-16 at 14.37.191136×1260 160 KB

If you are in these case, please send the information for each step

2 Likes
4

I had the same issue. Resetting the BMS fixed it. Before I opened up the battery & reset the BMS, it was stuck like this for a few days

  • No voltage to bicycle
  • 3 green LEDs are always on / the battery never goes to sleep
  • no power when plugged in (the charger doesn’t turn red)
  • I see the battery in the app, but when I try to connect, after it says “loading configuration information” it sys “error the device got disconnected”.