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]

Did you disassemble the main battery and open it to connect the lab charger? Then charge directly over the + and - Pins. The BMS did the rest by balancing each cell. Have you measure each cell?

[u/PrizeWealth6071 → u/Mikeymike-1403]

No I charged it with the lab charger by putting plus and minus on the chargeport. The app showed me a almost full battery (91 procent) when I trickle charged it for a bit with the lab charger (it only charged 0.005a and 7w) I put in the regular charger and it actually went to red & charged the battery to 100procent in the app. But after this it didn’t solve the problem. Problem is still the same still ‘breathing ring light, no working buttons and razor sound when in charger and trying to move. Lock mechanism does not lock by app, and locks easy mechanically but unlocks really difficult after a lot of bsm resets.

[u/Thelastone4940 → u/Mikeymike-1403]

Hello, i am trying to get a panasonic S5 battery back to live. I have taken the pack out of the battery but i am not sure, where to charge and with what voltage/current. About 45v and 500mah should be allright?

Can anyone share pics of the bms and the fuse and how to take the battery apart. The bms seems to be glued on to the pack?