From what I've read, anything 4.8V or higher, you're safe.

4.6-4.8v, you're probably safe, but not as safe as if you charged them.

Below 4.6v, don't fly.

What size plane is this one? The Alpha uses a 1amp load to test the battery. For a small plane, this is not a realistic load. It's too much. It should be more like 300mah. I can't remember on mine, but read the instructions on the Alpha and see if you program the other ports, to drop that down.

If you can program the other ports (you don't have to have a battery hooked up to them) then the load would drop respectively. Program all 4 and the load would be 250mah. This would be a more "real world" load to give you a more appropriate reading.

The 1000mah (1amp) load is ok, it will just show a "no fly" voltage sooner.

Mike