PoweraddDirect via Amazon offers its Poweradd Pilot X5 16,000mAh Dual-Port Portable Battery Charger for $31.99. Coupon code "CD9DWIF3" drops it to $24.99. Plus, Prime members bag free shipping. (Non-members can spend $35 for free shipping; otherwise, it adds $5.99.) That's the lowest total price we could find by $15 and the best price we've seen for a 16,000mAh charger. It features an LED flashlight, LED battery charge/discharge indicator, and two USB charging ports.