As the man says ... Fuhgeddaboudit!

There is around 3.6kg of naturally occuring tritium in the world, spread evenly around the world!

Manmade tritium? ... around 30kg ...cost? ... ~ $200,000,000 per kilo!

See

http://www.theoildrum.com/node/2806

Xeroid.

It says that tritium is a BYPRODUCT, not a requirement for the battery.

The profile of the batteries can be quite small and thin, a porous silicon material is used to collect the hydrogen isotope tritium which is generated in the process. The reaction is non-thermal which means laptops and other small devices like mobile phones will run much cooler than with traditional lithium-ion power batteries. The reason the battery lasts so long is that neutron beta-decay into protons is the world's most concentrated source of electricity, truly demonstrating Einstein’s theory E=MC2.