Multiply the battery volts x Ah, and that must not exceed 72Wh in carry on bag 11.4 x 3.3 = an awkward 43.662, I think ?
I haven't had any problems. I only got checked once. Just discharge your battery below 30%. Press the power button to show they aren't fully charged if asked by customs?
I've just flown British Airways last week with a drone and three batteries in hand baggage. UK to Cyprus.BA stipulate no more than 4 'spare' batteries, must be in carried in hand baggage, not the hold, and must be in original packaging or packaged separately so they can't touch/short out. 'Spare' means not installed in the drone, so you have one fitted and four spares.
Heathrow airport security didn't bat an eyelid or ask me to unpack to check, even though they were clearly visible and labelled as what they were, so I guess they are used to it and cool about it. - P
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