Pisen Electronics via Amazon offers its Pisen 10,000mAh LED Dual-USB Portable Battery Pack in several colors (Silver pictured) for $23.99. Coupon code "9VXSCLDX" cuts it to $17.99. Plus, Prime members receive free shipping. That's tied with last week's mention and the lowest price we could find by $2. It features a 3-digit LED battery level indicator, dual USB smart-charging ports (with 2.4-amp total output), and aluminum alloy shell. Deal ends December 31.