Eh Frosty ya might want to checkout the silicanchip website they have done 2 smart battery chargers and i've made the second version. It charges just about every battery bar the lipoly ones as they werent around when the circuit was designed. If you can still get a kit it wont be cheap off memory I paid $190 for the kit. albiet pricey I reckon you wouldn't find something similar on the market for anywhere near that price.
Cheers Bryan
Edit:- Here's the link to the above charger I mentioned.
https://www.siliconchip.com.au/cms/A_101728/article.html
Dont go paying for the article if this does interest you I can PM you the schematic.