Romoss Direct via Amazon offers its Romoss Ultra-Slim 2,800mAh Extended Battery Charger Case for iPhone 6 Plus / 6s Plus in Grey or White for $22.99. Coupon code "CHE8L884" cuts that to $16.78. Plus, Prime members bag free shipping. That's $3 under our mention from three weeks ago and the lowest price we could find now by $10. This silicone case allows charging and syncing with your original Lighting cable and features an automatic shutoff. Deal ends September 17.