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I once had one of those el cheapo chinese battery that didn't work at all on one of my Classic Army's AEG, but did work on another older Classic Army I had, so even if the battery works on your friend's Kwa M4, it might still not work on yours, so I'd suggest you to just get a better battery and check that first before doing anything else, so that you can rule that problem out if battery is not the issue.
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"Certainly there is no hunting like the hunting of man, and those who have hunted armed men long enough and like it, never really care for anything else thereafter."
- Ernest Hemingway
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