Electric scooters usually have high Ah batteries to make up for lower voltage compared to unicycles’ batteries. Dualtron scooters for example have 11Ah, 15Ah even 22Ah batteries! Charging at 2A with a single generic charger then becomes quite long.
Quick charging can be done using a multi-socket collector to connect up to 3x 2A-chargers, allowing more than 6A charge currents. For a 11Ah-battery, 6A corresponds to a 0.55C charge, so even such high current can still be considered a “soft” charge (recommanded charge current)).
Multi-socket collector “Minimotors” for Dualtron, with 3 inputs
The Charge Doctor-duo can be used to connect up to 3 (even 4) chargers after a very simple, quick and free mod. While allowing fast charging, it also comes with the usual intelligent features: display of V, I, Wh, Ah, datalogging and most especially automatic charge-ending to prolong the battery life.
|N.B. For Dualtron scooters, order the Charge Doctor on the Buy page, version reference = “Charge Doctor V2 DOUBLE INPUT for Airwheel, Solowheel, Firewheel”.
1) dismount the connectors of chargers 1 and 2
2) desolder charger 2 and solder its wires in parallel to charger 1
3) chargers 1 and 2 are now connected to one ouput connector to make a “double charger 1&2” delivering 2x2A= 4A
Charging at 6A with the Charge Doctor, connexion scheme
||charge 3 alone
other option : double charger 1&2 with only charger #1 powered
||double charger 1&2
||charger 3 + double charger 1&2
chargers #1 and #2 soldered in // to the same connector
double charger 1&2 connector
Mod by Smallexis from trottinetteselectriques.heberg-forum.fr
The Airwheels Q3 and its clones has big housing and a lot of internal space for a big battery pack. To double the capacity of the anemic original pack from 130Wh to 260Wh, Alexis has soldered individual cells recovered from an spare pack in parallel with existing cells, one by one. He has also shunted the BMS, of course.
I have installed a wheelco (bike computer on an electric unicycle) in my generic X3 clone. The mod was explained there. It was well integrated but very long to install.
The buzzer on my Gotway 14″ MCM 2S 340Wh is very loud. It’s a piezzo device, powered by a 25% duty cycle 3.3 khz square signal. The signal’s amplitude is 65V (the battery voltage !), no wonder it’s loud, and super duper annoying for you and certainly much more for pedestrians.
Unfortunately, as it has been said at length on the forum, the buzzer can’t be cut off because the GW has no tactile warning like tilt-back or vibrations on any other wheels. Without the beeping, you can overspeed (which can happens even at… 6km/h when the battery is near flat) and then, the wheel WILL shut the power down and throw you off. Yeah, as unbelievably stupid as it seems, it’s totally true : the wheel shuts the power down when riding to… protect you, nice logic, no ?
To reduce the volume and to make a Gotway ride more bearable, I don’t do the 100 Kohm potiometer-series-connected mod, it’s has been out there since the Gotway exists as a testimony of the super duper annoying buzzer (Gotway, please, do something !!!).
Here is my way to tone down the buzzer : a screw.
See here why you need to shunt the BMS (battery management system) on most wheels to avoid a faceplant.
List of shunted BMS :
The eWheel internals are accessible from outside, not requiring dismounting the two half parts, contrary to the original design in Solowheel or Airwheel. Good point.
BMS shunted by connecting B- to P- (red line) Continue reading