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Finished. I added a fuse and moved the low voltage cutoff board internally. The bottom boards required to be recessed 2mm to stop the screw headed rubbing.
An 18volt 2Ah battery should have a capacity of 36Wh.
Tested one of my 2Ah batteries. Charged to 19.95v. When the voltage had dropped to 15volt and cutoff, I measured 27 Wh.
An 18volt 1.3Ah battery (23.4Wh) measured 18Wh.
The Winners board has a maximum output of 5A, with a 4.5A advised continuous maximum. At 12v this would give a maximum of 54w. Enough to charge a phone or laptop, car 12v air compressor, 12v cool box, lighting etc.
The unit is very sturdy and the perforated boards allow for ventilation. A good learning exercise.