Hi,
Just to get back to the technical aspect of the Batteriser for a minute.
Here is the discharge curve of a Duracell AA battery:
If you take the point at 30,000 seconds, the open circuit voltage is 1.23 Volts and the internal resistance is 0.3 Ohms:
The 30,000 second point was chosen. The cell is half full or half empty depending on your view
So if you add a variable load resistor to the circuit:
And you monitor the terminal voltage, the cell current and the power dissipated in the load resistor you get this:
It is simply to not possible to get more than 1.26W
Now if I introduce a Batteriser. I have been very generous and given the Batteriser a conversion efficiency of 95%. The output voltage is being held constant at 1.4V
The results are:
The maximum load power is 1.17W. This is not a surprise since 95% of 1.26W is around 1.17W.
What is more interesting is that the circuit doesn't work at all on the low voltage side of the maximum power point.
This is because the boost converter tries to draw more current, the voltage goes down, it tries to draw even more current etc. until the terminal voltage of the cell is zero volts and there is no power in the load.
I submit that it is
simply not possible to build a Batteriser that will allow more than about 800mA from a half depleted AA cell.
I am waiting to watch how this plays out.....
Regards,
Jay_Diddy_B