The user's KuKirin G4 scooter only displays battery bars, not voltage. They want the dashboard to show voltage information to help diagnose power delivery issues.
I have a KuKirin G4 (60V) with about 3,600–3,700 km on it. I’ve owned it since June 2025. A few months ago I rode it in extremely heavy storm conditions (Ireland — torrential rain). After that, the scooter started cutting out and eventually the controller failed due to water damage. I replaced it with a brand-new genuine G4 controller (not programmable). Since then, the power delivery has been strange: * From full battery down to around 4–6 bars (display only shows 10 bars, no voltage or %), the scooter feels weak — acceleration and top speed feel more like a G2. * Once it drops below a certain bar level, it suddenly “unlocks” and delivers full G4 performance. * When unlocked, it pulls very hard and can hit 65–68 km/h on flat ground (I weigh 82 kg). * The power is completely consistent once unlocked — no surging or fluctuation. Originally, it would unlock around 4 bars. Recently, it unlocked around 6 bars instead. It does not show voltage, only battery bars. Motor feels strong once unlocked. No random cut-outs anymore. I’m trying to figure out: * Is this a voltage sag / battery internal resistance issue? * BMS behavior? * High-current wiring resistance from water exposure? * Or something specific to G4 controllers? Has anyone experienced similar behavior where full power only becomes available at lower battery levels?