Newegg offers the RAVPower Xtreme 23,000mAh Portable External Battery Charger, model no. RP-PB14, for $99.99. Coupon code "EMCPDHF47" cuts it to $89.99. With free shipping, that's the lowest total price we could find by $10. It features dual-USB 5V 3.5A max ouput, 9V/12V/16V/19V/20V switchable 4.5A max output, and a Li-polymer battery. Deal expires June 30.