Charger customization

Most e-wheels have settled for the GX16-3 connector. Some though use a different format and the corresponding charger may be difficult to find and are mostly more expensive. A customized charger with the right connector can be made from a generic 2A charger with the wiring instructions below.

Various e-wheel connectors, size and pin comparison

Most frequently found connectors

e-Wheel Socket Wiring Voltage Topo* Remark
Most e-wheels GX16-3 1: V+ ; 3: 0V 67.2V 16S connector for Solowheel, Airwheel, Gotway, Firewheel, King Song…
 Gotway MSuper3 84V/1600Wh GX16-4 1: V+ ; 2: 0V  84V  20S other MSuper3 with battery <1600Wh have GX16-3 connectors
IPS    (Holtz, Zero…) GX16-4 2: V+ ; 4: 0V 67.2V  16S warning, same connector as above but different wiring!
InMotion    V8 ** GX12-3 1: V+ ; 2: 0V 84V  20S same connector & wiring as  hoverboards
InMotion V3,V5 Lenovo Int:V+ ; Ext: 0V 84V 20S Lenovo square socket, originally for Lenovo laptop power supply
Ninebot One*** Lemo 63V 15S  see photo for wiring***
Ninebot   Minipro, Xiaomi ** GX12-4 1: V+ ; 4: 0V 63V 15S

*16S = 16 LiIon cells connected in series, total voltage calculated using battery full value =  4.2V/cell

** important, the numbering order on GX16-3 connectors is totally different from the GX12-3 : from left to right 3-2-1 for GX16-3 compared to 1-3-2 for GX12-3 !!!  Likewise for GX12-4 and GX16-4

GX12  and GX16 plugs, note the difference in pin numbering

*** Wiring for Lemo on NinebotOne


Ninebot One’s Lemo female connector

Beware of the charger

For this mod, I recommand using the fanless 2A generic chargers. Even if they tend naturally to warm much more than a (noisy) charger with integrated fan, they have many great features: available for various voltages, noiseless, compact and transportable… They allow fast charging at 4A by a parallel connection with the original charger using a Duo Charge Doctor (or even at 6A with the Triplex CD).

Warning though, some 1.5A chargers are sold as 2A chargers. They have a smaller housing and are very hot when charging, thus unreliable in the long term. When buying it online, the vendor never details the housing dimensions and count on the buyers not checking the actual current to sell it. Any vendor with such dubious practices should be avoided anyway. Without stated dimensions, the difference can still be found looking at the distance between the rectangle and the grooves (see arrows on the picture).  So don’t be misled, buy only the 2A charger with the bigger housing.
Chargers 2A and 1.5A, size comparison

Edit 4 dec/2016 : added image from Sylvain. Avoid the small housing charger!!
Small housing charger rated at 2A, too much heat melted the plastic housing.

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