6A charger with the Charge Doctor

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 current
2 A charge 3 alone
other option : double charger 1&2 with only charger #1 powered
4 A double charger 1&2
6 A charger 3 + double charger 1&2

*detailed steps

disassembled connector


chargers #1 and #2 soldered in // to the same connector


double charger 1&2 connector

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