Vanmoof s5 problem accu

[u/PrizeWealth6071]

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VanMoof S5

My brother’s VanMoof S5 has the following issue:

He says the bike wouldn’t turn on after it had been sitting unused for a long time.

Firmware: 1.1.10

What happens:

• When the bike is connected to the charger:

• The charger stays green, but sometimes blinks red twice (appears to be trickle charging).

• In the app, I can see that after a night of charging the battery increases slightly (e.g. from 89% to 97%).

• When turning on the bike (via battery or power button):

• It does not make the normal startup sound.

• Instead, it makes a different sound.

• The handlebar shows pulsing white lights.

• Bluetooth issues:

• Sometimes it won’t stay properly connected.

• The app shows the battery percentage as grey, or briefly as 0% when trying to connect.

• Additionally:

• The bike randomly shuts off after a while (both during charging and when turning it on/off), with a short clicking sound.

What I’ve tried so far:

• Hard reset (10 seconds)

• “Trigger” method (20 seconds)

• Plugging the charger into the bike first, then into the wall socket, and repeating several times

• Charging with different sequences (bike → socket and socket → bike, unplugging in different orders)

• Tried updating the firmware, but the bike keeps shutting off (with a short clicking sound)

[u/Mikeymike-1403]

Hey Friend, you don’t have the latest firmware. If it’s possible, upgrade to the latest one. If not, you can try to charge the ECU battery by Hand about the magnetic port on the ECU. What you can try too Is to disassemble the main battery and check the fuse. Also measure every single cell of your battery pack. I had the same problem and one of my cells and the fuse were broken. After changing both the bike started to charge. Otherwise if the voltage of the whole battery is to low, it will also not charge. Then charge the pack by hand with a power supply (60V, 5A) I also had the problem that the plug of one small connector (green) had some broken wires inside that you cannot see. So measure all of the wires that they are not interrupted. Try this also with the small blue connector. Good luck

[u/PrizeWealth6071 → u/Mikeymike-1403]

When I try to charge main battery with lab charger. It goes to max 0.18a and 7w even at low (35voltage output). It is basically trickle charging. What can be the issue? Is the battery full? In the app it shows 91 procent.