Hardware GBM battery life when using EZ4?

[5%]

Hey,

As we all know, flash carts drain the battery of a device quicker than a retail cart would. I was just wondering how many hours can one get out of a GBMicro with a EZ4 in slot, whilst having the brightness settings at maximum or a level below it. I heard it can last 3-4 hours, can anyone confirm this?

Thanks