I run in hot weather and that should not make them swell per say. run them to lipo cut off and then charge them up fully and see if you still really have 5k mah capacity. If you puff them a bit I'm suspicious you will not have full 5k mah capacity anymore. If they continue to swell at the end of runs and are running below 20-30% of their manufactured mah capacity, then dump them.
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