I have a MR3040 and it gives 4-5 hours with 2000 mAh. So one hour is about 500 mAh.
So any decent USB battery bank should do, you just have to choose the capacity you need. There are plenty to choose from. I have a 4x18650 Panasonic 3400 battery bank on order. Should give at least 24 hours runtime with some margin.
So any decent USB battery bank should do, you just have to choose the capacity you need. There are plenty to choose from. I have a 4x18650 Panasonic 3400 battery bank on order. Should give at least 24 hours runtime with some margin.