Radio Control

What type of radio control batteries have the longest run time?
I’m considering RC hobbies (either cars, planes or helicopters) as a new hobby. I saw a helicopter on an auction site, but the seller said that the battery had a run time of 6 to 7 minutes. Is this normal? Doesn’t sound like a whole lot of fun, unless I have to buy quite a few battery packs. Out of the three, which has the longest run time? I’d prefer helicopters, but I want the most bang for the buck starting out.
Lithium would be my first choice. If Lithium is not available then I would see if I could get Nickel-Metal Hydride (NiMH) though not as good as Lithium it is better than Nickel-Cadmium (NiCd). With Lithium you get full power until the battery is depleted, You are also able to charge them at any point and leave them on the charger. NiCd has a memory so you have to deplete the charge all the way (or really low) before charging or it will shorten the usage because it will think your last charge point is the depleted point. As for the RC longevity logically I would think the plain would use less battery because of it’s gliding. Though I have no personal knowledge of this. Sorry.
Kamps KJ-66 RC Model Turbine
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