I took my Phantom vision Plus out of the closet and had my WiFi repaired via eBay. Mailed it out Saturday and got it back 5 days later on Thursday. $40 plus $7.95 shipping.
My batteries sat for 2 years at about 75% charge. So I decided to drain them down to near zero and recharge them. I did this twice. Should I be concerned about battery failure?

UPGRADE | REPAIR DJI Phantom 2 Vision Plus Wifi Module LifeWarranty wCoolingFin | eBay
REPAIR & UPGRADE YOUR DJI Phantom 2 Vision Plus WiFi Module ! There are a few other possible causes of this including an unsuccessful firmware update via DJI app. AN OPTIONAL HEATSINK COOLING FIN/ MODULE FOR NO EXTRA COST.
www.ebay.com
My batteries sat for 2 years at about 75% charge. So I decided to drain them down to near zero and recharge them. I did this twice. Should I be concerned about battery failure?