Over a year old but I don't fly nearly as often as most.Bad cell? Under a year old? Contact 3DR, battery warranty is one year.....they'll need a flight log with that battery's usage.
I have a buddy in the same boat with an inspire, he replaced his four batteries with new. I bet he has maybe 2 hours on each battery....Over a year old but I don't fly nearly as often as most.
With that said, I have all my batteries (18 operational) and (6 new and unused) including the controller batteries charged to 50% in my refrigerator in MIAMI at 44 degrees while I'm away not flying for two months. Time will tell all this pays off.
thank you, RW for your past posts and thoughts.
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