This is a new product called “12V 40Ah LiFePO4 Bespoke Battery Pack & Peli™ Case” from the Tracer Product Range.
This battery pack has a weight of 10.7 kg and is 300 x 249 x 196 mm. Charging time of 5-7 hours with recommendations to fully charge at least once every 6 months. Only loosing less than 0.5% power per day through self-discharge. Packed in a Peli case for brilliant protection. Charging life cycle of over 1,400 times. You can see how much power is left and if you need to recharge on the Inside by pressing one button.