I ordered a PolarPro set of 6 on sale for $40 bucks on Best Buy online shipped to my local store. Just google Dji spark polarpro best buy" and it should come up
Here is my post on a thread of the issue myself and many Phantom 4 owners had to deal with regarding the remote controller battery issue that DJI refused to recall.
Phantom 4 controller not charging. Possible solution
Lol, Harborfreight is the devil....I always "have to go" because "I need this and I that". Harborfreight saved my Phantom 4 remote controller and saved me from having to deal with DJI