The Airwheel Q3 260wh has two paralleled 130Wh battery packs, each with its own BMS (battery management system). Even this setup, if not shunted, is still dangerous, tatane33 has had a fractured jaw because of a sudden power cut on his Q3. Peppuzzo has shunted both BMS for added security. He wants a fail safe wheel, which is understandable even if shunting just one BMS is probably enough.
Source peppuzzo of http://forum.electricunicycle.org
Airwheel Q3 clone
Q3 clone, before and after the shunt. Note the manufacturer has make a bad wiring, soldering together C- and P-, which means the BMS has no overcharge protection !!
Source smallexis from trottinetteselectriques.heberg-forum.fr
T1 and X1 are not easily distinguishable. When in doubt, shunt only the two middle Mosfets.