Follow-up question to Are battery packs allowed in hand luggage?
I have a 26,000 mAh battery pack ("Intocircuit Power Castle") which I want to take on a plane (Royal Air Maroc). Airline battery capacity limits tend to be based on Watt hours (Wh), and I'm confused about the conversion formula - specifically, the voltage part.
The conversion formula is mAh divided by 1,000 (or, Ah) times V = Wh. From what I can find online, V means "operating voltage", and this is where I get confused.
I can't see any reference to operating voltage on my battery. As for output voltage, there are four possibilities:
- USB at 5V
- DC at 12V
- DC at 15V
- DC at 19V
...which could give anything from 130 to 494, if any of these even are the operating voltage.
How do I find out the operating voltage to make this calculation? Or, is it possible to check based on mAh alone?
Funnily enough, someone asked my exact question about my exact brand of battery at some forum. Unfortunately, in a perfect example of why forums are terrible, instead of answering the question, they just started arguing about whether the asker even needed a battery (trust me, I do), whether it's standard to have power sockets on airlines these days (trust me, where I'm flying, it isn't), and recommending solar charging (that's already how I charge this battery!).