Chosen Solution
Hello, I’ve just bought the Xiaimo QiCycle bike, and I was so happy of my purchase. I’ve ride it to my work for a few time before winter, and I put it in the garage waiting for better days. The sun comes finaly earlier, and when i tried to charge the battery, nothing works…
I noticed that once connected to the charger, the green led of the charger did not turn red (charging indicator), while the indicator of the bike tells me that it is completely discharged This green led stay to green, and do not charge the battery:( Could you tell me what to do to find out if the problem is with the charger or the battery? Thanks a lot for your responses !
I had the same issue and looked for a solution for months. I left my bike over the winter and when i tried to charge it, i couldn’t. It seems the battery went into “sleep mode”, something lithium batteries do if they remain fully drained for more than a few weeks. The reason the charger remains green is that it doesn’t detect the battery due to its low voltage. When i tested the battery with a multimeter i was getting 1.5v rather than a healthy battery’s 40v. SOLUTION: Put the battery in the bike. Lift up the front wheel and spin it backwards, as if going in reverse. The white LED lights on the battery should blink. You are basically forcing a charge into the battery through the motor. You need to keep doing this until you get the voltage up to around 18v. At that point the charger detects the battery, turns red, and charges as normal. The reason this can’t be done via the charger is that the charger is “smart”. A chip deactivates it if no battery is detected. You can hear the deactivation click after a few seconds of plugging in the battery. Until that click your battery was charging. I used that as a shortcut to spinning the wheel which takes ages. I keep plugging in the battery, and unplugging at the click. If you have the multimeter connected to the other end of the battery at the same time you can see the voltage slowly increase. Keep at it until the chip detect the battery and turn the light red.
That did the trick for me! Pluging the charger (which remained green) until hearing a click sound, which happened after 1 or 2 seconds after Pluging the charger). When I heard the diud, unplugged the cable that connects the charger to the power supply, and waited until the green light turned off. Then plug the cable in again, and repeated thd process about 39 times, approximately, until instead of seeing a green light in the charger, the light was red. At this point I left the charger connected to the power supply and the battery was charged normally! Thank you to the guy who suggested this method (see above). It did work perfectly well, like a charm!!!
Could any one tell me the right state of the charger led when the charger is connected to AC/DC input, but disconnected from the battery ? Not connected to the battery, this led should be green, red, or turned off
It’s not working for me. I have been spinning the front wheel for about 15 minutes. The battery lights started flashing. Sometimes two of the (first and third), or all of them. I don’t know what is the meaning of that. Still not working.
Glad you got it working
The plug and unplug works! Plug , will hear first click, second click, unplug , How long does it take for the the display turns on?
I fixed this by turning the front wheel around (so it’s riding backwards) and doing a 5km lap of the park This charged the battery enough for it to recieve the voltage with the charger.
I had the same “symptoms”, as described here. The Plug/Unplug technique didn’t seem to work, although hearing the clicking sound. After opening up the rear part of the battery to reveal the BMS, I could see the plug for balancing the cells (the plug with many wires attached) wasn’t connected cleanly/flush. Looked like a production quality issue. After reconnecting my battery recharges fine. Just in case someone needs to hear this
