Anker is one of the top names when it comes to battery packs. And it's because they have great products and they are pretty affordable. Right now they've got their 2nd Gen Astro E5 16,000mAh battery pack on sale for just $29.99. Amazon actually lists it for $39.99, but if you use promo code -ASTROE52 - you can get it for just $29.99. Which is a really great price. You can grab yours from the link below.