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From my knowledge on battery (I work in Battery firm), Ni Cd is by far the most robust and have the best discharge rate. That's why the drillers still use NiCd as source.
Also the NiCd is the longest lasting battery (preformance stability), as well as best discharge rate. The reason for fading out is it cannot be recycled properly due to cadmium presence. As long as you properly use the Nicd, it can take 500+ cycle still remaining 90% performance.
Sure Li polyer battery have high energy density, but it is not as robust and performance drop is more significant than Nicd. Also discharge rate cannot match Nicd at the moment. (please compare discharge rate with same voltage)
For Airsoft, it's better to stay with Nicd, esp if you will upgrade in future.
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