Do you mean: Charging AA, using it one hour, then SHUTTING IT DOWN, waiting 4 days and then turning it on? If that is the case, then I always get a good 22 hours out my dual batteries regardless of the number of times I turn it off.
HOWEVER, if you leave it on but just not playing music, the Raspberry Pi is a full blown computer. It will consume battery life quite a bit.
It would be nice if you could be a little more precise in your example so we could compare more accurately with our own observations.
The Air was plugged in on a Saturday. Used for maybe 30 minutes but on high volumes.
It then sat for a week, only turned on each day to test and check the red light status.
I thought that was pretty clear.
I'm not sure how to state it any other way.
I think the unit we have has the 9h battery. Perhaps it is a bit different with the dual battery, but still relevant if the charge is lost over time sitting unused.
Ours can sit for about a week before it doesn't have much charge left.
If the red light goes solid red when there is 20% or less charge remaining, then great. But what if there is only 30% charge left, the unit had sat for two days and a person wants to use it the next day for only an hour.
Do they need to charge it first?
Do they have time to charge it?
How long does it take to get the charge up to 50% or 60% to be sure you can get an hour use out of it?
Anyone with a cell phone asks these questions all the time. Before you leave the house and your cell has only 20% charge left, will it die before you return home? Will you be able to get out a call for more than 2 minutes if you needed?
Do you have ten minutes to charge it before leaving the house and if so, how much will it charge the phone? (My new Google Pixel 2 fast charges like mad. Ready in less than an hour. Love it. How about the Axiom Air?)
