Battery lifespan?

Battery life is dependent on how you use them, and also store them. Using them harder (more current draw), and discharging them to more lower service life. Also to a lesser extent storing them fully charged. My P4 batteries self discharge to 65% after 10 days, which is DJI's recommendation for storage charge level. I would concur with the 30% recommendation, but of course that reduces the utility of the drone. If you get 50 flights out of a battery, that's about $3/flight. I would expect 100 or more flights, but some of the pilots here have reported getting less than 50 flights on a battery. I would also concur with removing the battery from service if it shows any signs of swelling. I check my batteries as part of my preflight.
 

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