Portable batttery packs are a great accessory when you're on the go and using your device a lot -- whether in a succession of meetings or on a long plane trip.
For these kinds of needs, batteries with around 5000 mAh are a good sweet spot -- still quite portable (at around 5 ounces), and typically with the power to charge your phone plus other devices at the same time -- including tablets.
In terms of capacity, 5K mAh provides the equivalent of 2 to 3 full charges for a phone. Plus these packs deliver at least 2.1 Amps of current, sufficent to power today's tablets. And they're large enough to offer multiple connectors, often standard USB plus other cable types.
For all these reasons, my go-to day-trip portable battery has been the TYLT POWERPLANT portable battery back (see earlier post), which delivers 5,200 mAh and 2.1 Amps in a compact 5.4 ounce rectangular box. It has a USB connector plus one other cable. It's still available, reduced to around $20.
Meanwhile, TYLT has a new line of ENERGI battery packs, including 3K, 5K, and 10K (mAh) capacity, with models featuring one or two different cables.
In particular, the TYLT ENERGI 5K+ battery pack provides 5,200 mAh of capacity with 3 Amps of total output -- to charge up to three devices simultanously.
To feed three devices, the ENERGI 5K+ has a standard USB connnector, plus two built-in 4 1/2 inch cables providing a Lightning connector and a micro-USB connector.
The cables wrap around the sides to pack away, and the connectors are extended enough that they can reach through at least some cases.
The battery is relatively light, at around 4 1/2 ounces, with a thin shirt-pocket design -- only 9/16 inches thick and 5.59 x 2.76 inches.
It has a color LED indicator for the power level -- green, amber, red, and flashing.
The ENERGI 5K+ is a great answer when you need reserve power for day trips -- It delivers significant power in a relatively compact and lightweight design, with the bonus flexibility to charge multiple and different devices.
It's available for around $59, in blue, red, and black.
Find the TYLT ENERGI 5K+ Battery Pack on Amazon.com