Keep your devices charged all summer long by having a power bank in tow. The following external battery packs are powerful enough to provide a couple full charges to smartphones and at least one full charge to tablets. Use the dual USB ports to charge multiple devices at the same time.
- RAVPower 10400mAh: $25.50 shipped w/ code 5G9CJNPZ (Reg. $35) | Sunvalleytek
- New Trent iCarrier 12000mAh: $29.95 shipped w/ code POWERBUD (Reg. $38) | idealpoint
Both power banks are rated 4.5 stars from thousands of Amazon buyers.