A battery charger is basically just a power supply, technically, most batteries can be charged with most power supplies if set up properly. You should look up the power ratings of your batteries and see, if your current charger is set up for a higher power rating than the AB batteries the charger can overcharge or undercharge the battery which will affect its capacity. Also, in each AB cell pack is an EPROM or RAM which counts the number of cycles the battery has gone through, It can get damaged and then it won't charge properly. Anyone whose seen a Dionic battery when put on charge- the red and green lights just keep flashing back and forth-- that means the battery isn't communicating with the charger; either due to a problem with the input circuit on the battery (the only thing to try is the reset button next to the display) or the PCB on the charger.
I have charged AB batteries on non AB products, but I was able to set all the parameters and it was used on a charger which accepted the different battery types (Li-Ion, NiMH ect.)