E-cart 24V Throttle with key switch voltage level indicator For Bike

This integrated throttle assembly is designed for vehicles running on a 24V battery, combining three functionalities into one neat handlebar unit: 

• Twist Throttle: The main component is a standard twist grip that controls speed by varying a Hall sensor signal (generally 0.8–4.2 V range). It’s identical in function to typical e-bike throttles and plugs into the controller’s throttle input. With 24V systems, the motor’s full speed will correspond to full twist, etc., as determined by the controller programming. 
• Key Switch: A lock with key is built into the throttle housing, allowing the user to turn the vehicle’s power on or off. In the “Off” position, the connection between the battery and controller (or controller’s enable line) is opened, meaning the vehicle cannot be started or gain throttle response. Turning it to “On” supplies power and arms the controller. This adds a layer of security for 24V go-karts or scooters – one must have the key to drive. It also functions as a safety lock; one can remove the key to ensure kids or unauthorized persons can’t accidentally power it up. 
• Voltage Level Indicator: An array of LEDs or small gauge on the throttle displays the battery’s charge level. For 24V lead-acid systems (which often charge up to ~28-29V and are considered “dead” around ~21V under load), the meter will typically have a few gradations: e.g., 100%, 75%, 50%, 25% (red). If it’s a series of 3-5 LEDs, when all are lit the battery is full, and as the voltage drops, fewer LEDs remain lit. This is very useful to keep track of the relatively limited range of 24V packs. It can also work for 24V lithium packs (which have a similar voltage range, e.g., 25.2V full for 7s Li-ion, though often 24V refers to lead-acid systems of 2×12V).