Question about Microsoft Xbox Play & Charge Kit (USB-C)

Excellent batteries, I have bought alternative brands like "venom", and they are good for the dump 1-2 years later. But my "Microsoft" batteries hold up well even after several years (for the 360 and the one). It's a pity that they are sold at a higher price by a digitec partner when they are (normally) 24.- with shipping costs at Microsoft.