Hello everyone, This is my first post, happy to be here. I'm new to the headphone world. It all started with the smule singing app. I use Sony MDR-ZX700 headphones for recording purposes. After recording i listen to recorded songs via Sennheiser HD599. My phone, Sony xperia xz premium is very pleasant and warm sounding, but struggle's to properly drive my sennheiser HD 599 headphones. After reading a few reviews here, i found that chord mojo is very warm sounding and have ample power. Some videos online indicate that there seems to be a big problem with the battery of Mojo. How many years of trouble free experience do u have? your reassurance can really help me decide. Thanks in advance, Regards.