Originally Posted by Baxide
The lead acid battery is from Yuasa and it says 2.8Ah on it. The Li-po pack says it is 5600mA.
You could be right about the internal battery resistance and the discharge rate.
So it appears that the Yuasa is 2.8 Ahr, the LiPo battery is 5.6 Ahr.
This means 2.8 Amps X 1 hour.
The problem with a spec like this is to properly compare them they must be referenced to 2.8 Ahr @ 8 hours or something like that so you know how long you can draw current from it before battery voltage drops below it's critical discharge value, i.e. you do not want to over discharge a battery.
So if this number is referenced to 10 hours then you can draw 0.28 Amperes for 10 hours: 0.28 Amperes X 10 hours = 2.8 Ahr.
Batteries are not linear so you cannot extrapolate it to 8 hours or twenty hours or 100 hours.
They will give numerous specs for numerous discharge times.
At first glance the Li-Po looks superior, but obviously something else is going on.
The batteries will have a complex output impedance, i.e. some resistance, inductance & capacitance.
But I would imagine that a charged battery should be quieter than an AC-DC power supply!