The best on-line guidance I can find is:
and the former page links to:
So, put the batteries for your camera in your hand-baggage and protect them from short circuiting and you shouldnt have a problem.
British Airways' Guide to Dangerous Goods April 2010 says
"Equipment containing such batteries may be in checked or carry-on baggage." That does seem to be the case, but who want to entrust their camera or laptop to airport baggage handlers?
That covers the question the OP asked so you can stop here ... but!
Laptop batteries are similar, only the high-capacity versions may be more problematical.
Unfortunately, even for the technically minded, the current
ICAO guidance in not very transparent:
Consumer electronic devices (watches, calculating machines, cameras, cellular phones, laptop computers, camcorders, etc.) containing lithium or lithium ion cells or batteries when carried by passengers or crew for personal use. Spare batteries must be individually protected so as to prevent short circuits and carried in carry-on baggage only. In addition, each spare battery must not exceed the following quantities:
- for lithium metal or lithium alloy batteries, a lithium content of not more than 2 grams; or
- for lithium ion batteries, an aggregate equivalent lithium content of not more than 8 grams.
Lithium ion batteries with an aggregate equivalent lithium content of more than 8 grams but not more than 25 grams may be carried in carry-on baggage if they are individually protected so as to prevent short circuits and are limited to two spare batteries per person.
An amendment has been tabled to revise these to use Watt-hours rather than grams of lithium content, thus:
Consumer electronic devices (watches, calculating machines, cameras, cellular phones, laptop computers, camcorders, etc.) containing lithium or lithium ion cells or batteries when carried by passengers or crew for personal use. Spare batteries must be individually protected so as to prevent short circuits and carried in carry-on baggage only. In addition, each spare battery must not exceed the following quantities:
- for lithium metal or lithium alloy batteries, a lithium content of not more than 2 grams; or
- for lithium ion batteries a watt-hour rating of not more than 100 Wh.
- Lithium ion batteries with a watt-hour rating of more than 100 Wh but not more than 160 Wh may be carried in carry-on baggage if they are individually protected so as to prevent short circuits and are limited to two spare batteries per person.
Is your head hurting yet? Mine was
but help is at hand, so carry on reading.
What does all this mean?
Firstly:
Watt hours = Amp hours x Voltage = (milliAmp hours / 1000) x Voltage
So:
at 20 V (to cover 19 V laptops) 100 Wh is equivalent to 5000 mAh
at 10 V (to cover most digital cameras) 100 Wh is equivalent to 2500 10000mAh
Taking as ab example Nikons EN-EL3e with a rating of 1500 mAh and voltage 7.4 V, this is equivalent to 11.1 Wh.
Then there are a couple of useful rules of thumb :
2 grams Equivalent Lithium Content (ELC) are about equal to 25 watt-hours:
- at 10 V this is equivalent to
625 2500 mAh
- at 20 V this is equivalent to 1250 mAh
8 grams Equivalent Lithium Content (ELC) are about equal to 100 watt-hours:
- at 10 V this is equivalent to
2500 10000 mAh
- at 20 V this is equivalent to 5000 mAh
25 grams Equivalent Lithium Content (ELC) are about equal to 300 watt-hours:
- at 20 V this is equivalent to 15000 mAh
Finally, for a 20 V (laptop) battery:
160 Wh (the propose upper limit) is equivalent to 8000 mAh
After all that, I conclude that I will be able to carry all my spare batteries in my hand baggage up to and including 2 high capacity laptop Li-ion batteries (my biggest is rated at 7800 mAh). And I now feel I know enough to argue my point at the check-in desk!