Make sure you cycle the batteries on a cycler. The meter on that radio is not accurate at all. My friend kept testing his by just timing it thinking he could fly it and thought the batteries were good by checking them the way you are, and I put it on a cycler and it failed in 10 minutes. Not a good thing. The cycler puts a better load on them. I like to cycle a pack 2 or 3 times to make sure it is good. It should cycle at least 70% of its rated capacity or it is not something I would use. I actually throw them away if they are below 80%. Not worth risking a plane on. If you watch ebay, you can usually get both rec and trans batteries new for a really good price. I got a couple Futaba brand 1000 mah packs for under $15 brand new from people that bought systems and just wanted the transmitter or there are some suppliers that are really good too.

Good luck.