Newegg offers the second generation Anker Astro E4 13,000mAh External Dual USB Battery Pack in White, model no. 79AN13K2-WA, for $29.99. Coupon code "EMCATNS25" cuts it to $23.99. With free shipping, that's tied with our April mention of another color as the lowest total price we've seen for this battery pack. (It's a current low by $6.) It features an LED flashlight, fail-safe protection, and device detection for up to 3-amp charging. Coupon ends July 1.

Also available is the RAVPower Deluxe 14,000mAh Portable Dual USB External Battery in White, model no. RP-PB13(W)-2, for $34.99. Coupon code "EMCATNP82" drops it to $27.99. With free shipping, that's $72 off list and the lowest total price we could find, although we saw it another color for a buck less last month. It features an LED flashlight, auto-off, and 1.5-amp and 2.4-amp USB ports. Coupon ends June 29.