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    Does anyone know what "M_Ctr" pin is on the board of a QS-S4 type display unit?

    I'm modifying the throttle on my Laotie L6 Pro (generic dual-drive 800Wx2 Chinese e-scooter sold by Banggood). In the process of taking it apart to apply the modification, I noticed that there are two buttons, but three pins on the board. The pin labeled PwrKey obviously goes to the power...
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    How much can I overdrive a BTwin Elops 500E "24V" motor?

    I've found a fully functional Elops 500 E bike in a thrift store for €185. On its own it's fairly weak, as it has a 24V 250W PAS powertrain that's nothing to write home about. However, I happen to have a surplus 48V controller, dashboard and battery. The controller is good for about a...
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    Can I run mixed FETs of the same current spec on the same controller? Voltage spec different but both way above requirement

    I have a Ninebot controller with burnt traces - e-braking spike fried them and the resulting angry electric pixies killed a couple of the FETs. I have another identical controller that died for other reasons and still has the high-power section intact. I wanted to salvage its FETs and use them...
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    Trying to identify internal solder pads in a JP 20A controller

    I got a Laotie L6 Pro electric scooter. It comes with two JP 20A 48V controllers, a master driving the rear motor and a slave driving the front one. The wiring is the usual Chinese ratnest, but with the help of a multimeter, a few videos (tip: the Yume X11 scooter seems to be wired identically)...
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    Weird Hall-effect position sensor readings

    I bought an e-scooter second hand. It has a sensored motor, but the previous owner modified it with a 25A sensorless e-bike controller. Said controller is huge and overpowered, so I want to replace it with a more reasonable 18A scooter controller I have kicking around. Unfortunately this other...
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    Wiring of a separate port BMS as common port

    TL;DR: the BMS has a port for charge and one for power. It can charge through the power port. Will it also balance through it? I have a generic BMS I salvaged out of a dead e-scooter battery. I want to use it on an external battery that'll go on the stem of another e-scooter as a range-booster...
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    Decathlon Tilt/Hoptown 500E: overvolting stock motor

    A friend has given me the titular bike with a dead battery. It runs on 24V, which might be fine for flat areas, but our city is anything but and the assist fades pretty quickly when going uphill. Given that the battery is already gone, I thought of swapping out the controller for a 36V 500W one...
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    External balancing chargers in place of internal BMS

    Given my proclivity to experiment with battery packs of various configurations on my e-scooters (and just wait till I get into e-bikes...) I'm wondering if it makes sense not to bother with internal BMS installs. I've been into FPV quadcopters for a while now, and have a bank of four ISDT...
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    Long-term reports on LiitoKala 32700 LiFePO4 batteries

    I'd like to build a generously-sized battery pack (15s3p) out of these for use on an electric scooter, the idea being to make some size compromises (like an extra layer of cells on the footrest in a dedicated box...) in order to have a long-duration battery that I don't have to baby and worry...
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