I parallel a 23.2ah/80a & 17.5ah/100a together total poss current is 180a, the current is drawn from the pair with obviously one supplying a very slight higher current. Both batteries voltage reduction is steady and much in sync with each other.
I have two Swizz's the first one Jimmy replaced the old knackered Li-po pack with Boston cells, although the pack is 39a rated range is terrible. This bike has motor issues and the troublesome rear sram dual drive hub is very worn, I tried to source new brushes but wasn't able to get the right size or connection so managed to get some close and file them to fit. However the motor isn't running very nicely.
Sram no longer make hubs so not rally worth the effort repairing, an alfine 8 would be better and to remove the cassette altogether it is really fit for stripping and a conversion to a mid drive like a TDZS so that it rides in a similar way.
Bike #2 is all original, over the years they have had nicad, nimh, li-po and a few stull running updated to li-on. #2 had knackered nimh so I converted the set up to li-on.
How many are actually left ?
I know of two running bikes mine and a few in Germany, on the pedelec.de forum
Swizzbee 50C 24V – Chris Redel's 2-wheel offensive (e-bikefreun.de)
I did have a Chris's blog earmarked in my favourites, but my pc seems to have had a moment and erased it. Chris has bought up or taken possession of quite a few non used bikes for spares and has by the sounds of it plenty to keep him going for years.