The first entry here is a "how-NOT-to" article. I added some stuff to my FMA SuperNova (also sold under other names) and while it all worked out in the end I don't think it's worth doing as it's quite annoying and it has a high probability of mishap.

The other articles show stuff that's actually worked out pretty well. I've added top-mounted Sermos connectors to my Robbe Infinity II which makes life quite a bit easier.

The last one involves adding a small power supply inside the SC/C charger that SR Batteries used to sell. It only puts out 2A / 12V so it isn't large enough for fast-charging, but it works just fine for slow-charging and cycling cells at home.