Batteries & air-travel

Has anyone had any issues when trying to travel with batteries?
It seems to be different for each airline and country.
I found the following pages with some useful information:
- http://safetravel.dot.gov/whats_new_batteries.html
- http://safetravel.dot.gov/how_to.html
- http://safetravel.dot.gov/larger_batt.html
Qantas have the following limitations:
I was surprised that Singapore Airlines have no restrictions regarding batteries mentioned on their website.
It seems to be different for each airline and country.
I found the following pages with some useful information:
- http://safetravel.dot.gov/whats_new_batteries.html
- http://safetravel.dot.gov/how_to.html
- http://safetravel.dot.gov/larger_batt.html
Qantas have the following limitations:
Portable electronic devices containing lithium or lithium ion cells or batteries and Spare lithium or lithium ion cells or batteries
Spare Lithium ion batteries and cells with a Watt hour rating greater than 160Wh, are not permitted on an aircraft under any circumstances.
Spare lithium ion batteries and cells with a Watt hour rating of between 100Wh and 160Wh are limited to two batteries per passenger. Batteries must have terminals insulated or protected to prevent short circuit and must be carried in cabin baggage only. – Operator approval is required for these prior to travel.
Spare Lithium ion batteries and cells with a Watt hour rating or less than 100Wh have no limit to the number that can be carried, batteries must have terminals insulated or protected to prevent short circuit and must be carried in cabin baggage only
Spare Lithium metal or Lithium alloy batteries with a lithium content of less than 2 grams have no limit to the number that can be carried, however, batteries must have terminals insulated or protected to prevent short circuit and must be carried in cabin baggage only.
If batteries are installed in equipment such as laptop computers, camera, calculators etc – the above limits still apply, however they can be carried as checked baggage, provided the electronic device is protected from accidental activation.
Note: Conversion from Ah (Amp hours) to Wh is: Ah x Voltage = Wh.
Spare Batteries for Consumer Electronic Devices
All spare batteries for consumer electronic devices must be carried in carry-on baggage only. They must be individually protected to prevent short circuit using one of the following:
In original retail packaging;
Taping over exposed terminals;
Placing each battery in a separate plastic bag or protective pouch.
I was surprised that Singapore Airlines have no restrictions regarding batteries mentioned on their website.