If those are rechargeable NiMhs, you can charge them in the radio. Its limited so it's a slow charge - would have to know what the charger output says, but you're looking at overnight.

I use a 3PK and 3PJS Futaba radios and when I was using cells both were running NiMh. Not sure why Futaba only mentions NiCd, but mine have never had probs with NiMh (running lipo now though).

Long term, get an RC charger - shorter charge time and the newer low self discharge AAs, those are the best.