Question: are anker batteries lithium ion?
Answer: Anker PowerCore+ ($129.99; amazon.com) This top-rated battery pack from Anker packs the most power you're allowed to take on a flight. The Anker PowerCore+ comes in at just under the FAA's 100-Wh battery restriction, with 26,800mAh (milliAmp hour) of power and a 3.7-volt standard lithium cell.