Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Is this battery safe for airline travel?
Document: Works as described though I wouldn't form any serious expectations about your particular device's use time this will add from anything said. That's very different for each device and each user. If you know you'd like to carry a good amount of extra power with you, this will do that. It's simple to use. I use it mainly for using my laptop longer when I travel. Only downsides are that it's heavy and ugly as sin.
Use it all the time and gives me the battery time I expected
I highly recommend this if you are looking for a battery pack that will last many hours. I am very happy with my purchase and will buy it again in future.
This would also be great for camping, school, etc. Power outage? If you make it a habit to keep the bix battery charged, you're still in business, at least for several hours!
The cable MAY disconnect in the battery charge process. It did not during my charge, but if bumped it may occur.The battery itself does not generate much heat while charging, but the black AC switching power supply box gets quite warm.
VERY GOOD EXTERNAL BATTERY. Very Good, Well priced, FAST CHARGING... 125 whr, NOT 153 whr... external battery.Compares very favorably price wise with the lower capacity Instapark product (see my review) and seems to charge in less than half the time.
I threw it away and got this as a replacement.With the BiXPower 153Wh, it was much bigger than I expected it. However, this is to be expected as it is 42500mAh in capacity. I carry it in my backpack wherever I go and do not have to worry about my laptop running out of battery even after long uses in lectures or when I am studying in the library reading through online journals.
The BP160 seems to be an excellent, high capacity, external battery, and a very good solar battery for electronic equipment... as well. My rating is not yet a 5 star for several reasons:a. At a measured 125 whrs the BP160 is a great value compared to alternatives! But it is NOT the 153 whr that they advertize, at least the unit I have is not according to my measurements. So that restricts my rating until this gets clarified.
Received 2 days ago.PROS- Charged no problem, and fast given capacity.- Discharging no problem to power my laptop. My laptop battery is 63 Whr so this can nearly quadruple my run time.- Appears rugged construction.CONS- USB port is 700mA. 2A would be preferred.- Despite 4-LED charge status, knowing it's true charge will take some guesswork.
Just be careful.So, if you know of a better external laptop battery, well priced, fast charging... please let me know!2. The BP140 May, MAY... be an EXCELLENT solar battery! My testing does not bear that out yet, but I trust the word of BixPower support that with their 40 watt folding panel in peak summer sun max input accepted should be up to 22 watts/hour. Very acceptable!
Answer: I think I answered my own question, according to http://safetravel.dot.gov/definitions.html#spare_batteries, batteries over 300 watt-hour are prohibited. I'm sure it depends on the airline, international travel might be a bit more picky. Thanks for the quick responses. This battery is 153wh so it should be fine in your carry-on.Equivalent Lithium Content (ELC). ELC is a measure by which lithium ion batteries are classified.    8 grams of equivalent lithium content are equal to about 100 watt-hours.    25 grams of equivalent lithium content are equal to about 300 watt-hours.You can arrive at the number of watt-hours your battery provides if you know how many milliamp hours and volts your battery provides:mAh/1000 x V = whMost lithium ion batteries marketed to consumers are below 100 watt-hours (8 grams ELC). If you are unsure of the watt-hour rating of your lithium ion battery, contact the manufacturer.