I use the stock Sanyo NiCad batts for my 3PKs, those have lasted me eversince I bought the radios.
I also have the Futaba Megatech AA batt tray (not sold in the US, only found in Asia), and if ny NiCad TX batts are on the charger, I slap in the Megatech AA batt tray loaded with 1.2V NiMh AAs and put that in.
Yes, home use NiMh AA 1.2V batts are pretty lame in that they DO NOT HOLD A CHARGE over time [
].
Its more or less use them after you charge them within a few daws, or live with half of their capacities dissipated. I do not know why NiMh bleed off capacity way too fast.