ORIGINAL: Jezmo
I have a CBA III that indicates my Genuine Sanyo Eneloops stay above 1 volt all the way up to 8 amps and at 10 amps are right at 1 volt per cell. For those who might be interested, don't try to pass more than 4 amps through one of the regular battery/servo type connectors such as a Futaba ''J''. Ask me how I know and yes I have a scar on my thumb and forefinger as a reminder - that little plastic connector can get real hot.
I tend to agree with Jezmo and there is plenty of examples out there to evidence what he is saying.
I also use Sanyo Eneloop 5-cell batteries on all my 50cc planes and smaller and without any problems.
Most of my planes have 2 battery packs (2,000mAh each) and two switches. When I had money to burn holes in the pockets, I bought some of the 42% 2-Pac units and put between the switches and receivers but only on a couple of occasions.
Bigger than 50cc, I have normally gone for A123 and a powerboard of some sort
We tend to overcomplicate things in this hobby and be instantly drawn towards all the latest gadgets.