The little AA cell has a higher Amp-hour rating than the big lithium power tool battery - what's that all about? Amp-hours aren't a measure of total energy stored. For that you need to calculate Watt-hours (Volts x Amps x hours).
Ryobi lithium power tool battery: 18 x 1.4 = 25.2 Watt-hours
Sanyo eneloop AA cell: 1.2 x 1.9 = 2.28 Watt-hours
Not surprisingly, the power tool battery has more than 10 times as much stored energy than the AA cell.
Ryobi lithium power tool battery: 18 x 1.4 = 25.2 Watt-hours
Sanyo eneloop AA cell: 1.2 x 1.9 = 2.28 Watt-hours
Not surprisingly, the power tool battery has more than 10 times as much stored energy than the AA cell.
that's why i prefer Wh over Ah. Besides a battery doesn't stay at the same voltage all the time anyway. So Ah becomes…. weird.Especially since in at least my applications uses the same wattage regardless of input voltage.