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 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.