eCase via Amazon offers the KMASHI 10,000mAh External Battery Power Bank
for $11.19. Coupon code "6DKMCGHT" cuts it to $9.20
. Plus, Prime members bag free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.55.) That's the lowest total price we could find by $5. This battery includes two USB ports and is capable of charging an iPhone 6s, 6 Plus, iPad, Samsung Galaxy, and more.