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From what I understand lithium based batteries also have a limited lifespan regardless of usage. The chemical reaction dies out after about five or so years whereas nickel, lead and other types that have been around a while have a longer usage life. This is why you find people complaining about replacement batteries for their older phone/camera/laptop that they just bought, the batteries were probably manufactured several years ago and so even though they were purchased "new" are now pretty useless. I also have a long term RC obssession (mine's cars) and I stick with NiMH and avoid using LiPo as much as possible, much easier and safer to use/charge and no real performance difference that matters (I don't race, just play around for fun).
Spending money on a quality charger and quality battery will pay off in the long run with consistant performance. Wanting to be cheap about powering a good mount is like buying a new Lambo and getting them to swap out the V12 engine for a 4 cylinder.
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