Batteries that could last 30 years in a laptop!

Your next laptop could have a continuous power battery that lasts for 30 years without a single recharge thanks to work being funded by the U.S. Air Force Research Laboratory. The breakthrough betavoltaic power cells are constructed from semiconductors and use radioisotopes as the energy source. As the radioactive material decays it emits beta particles that transform into electric power capable of fueling an electrical device like a laptop for years.

I say this will be nice, the battery last longer than the laptop? Would you be able to buy laptops without batteries and install the old one with the new one? I would hope, if it last 30 years without a new one, why would you need a new on to come with a laptop? I wonder if this going to bring the laptop prices down if they don't have to include the battery!!