I love it, great work! Is there any possibility to get away from the laptop load and use perhaps an ac light? Depending on what the processor is doing, the laptop will have different loads. Testing may not be consistent. You will have a higher load current when plugging laptop back in as laptop battery will not be full. A light or something similar will always have the same load.
As I see it, you will turn the load on/off as the battery voltage nears, or is at the absorption voltage. The battery should be near full and have a higher battery resistance. We should expect a higher voltage jump. The big question is, how does the CC react? Is it fast enough to react to the initial stage of the voltage jump to shutdown all charging current and limit the jump to a smaller magnitude.
If you really want to be industrious we can get a much better understanding of battery resistance if you take measurements every 0.1V intervals. For example start at 13.9V, then 14.1V, 14.2V, etc. Measure the voltage jump and change in charging current. Calculate battery resistance: R_bat = delta V / delta I.
Sal
