omfg if it does pass thru power i’ll lose my mind. my car has a “modern” cassette player with a hole in the door for one of those 3.5mm to cassette converters, i could make this WORK
I have one of these, not sure if its the exact model but i can confirm. Comes with a battery.
Can also confirm (to my annoyance) that you cannot have it charging and play music at the same time. So don't bother buying a slim angled micro usb cable like I did...
It's not too shabby, never really counted it but I believe it lasts for about 6h at least on a full charge? I usually only drive for around an hour max though so it's more of a guesstimate