Based on this product's specifications, here are some alternatives and similar models
Plastic Welding Machine YATO 3.7V 2.0Ah in BMC – Cordless Plastic Welder for Repairing Plastics
Summary description:
Cordless plastic welding machine by YATO, powered at 3.7V with a 2.0Ah battery and supplied in a BMC case. Designed for joining and repairing thermoplastic components, it is suitable for automotive bumpers, plastic housings and small repair jobs. Portable and battery-operated for on-site use where mains power is unavailable.