In fact, diamond is the hardest substance known to man, there is literally nothing we could use that could offer more protection.
Aside of that, it's a really cool idea. My only fear is it being deemed as tech only for science and military institutions while leaving the rest of humanity with AA/AAA crap forever. The original article also didn't seem all that interested in talking about them as anything viable for normal use.
Despite their low-power, relative to current battery technologies, the life-time of these diamond batteries could revolutionise the powering of devices over long timescales. The actual amount of carbon-14 in each battery has yet to be decided but one battery, containing 1g of carbon-14, would deliver 15 Joules per day. This is less than an AA battery. Standard alkaline AA batteries are designed for short timeframe discharge: one battery weighing about 20g has an energy storage rating of 700J/g. If operated continuously, this would run out in 24 hours. Using carbon-14 the battery would take 5,730 years to reach 50 per cent power, which is about as long as human civilization has existed.
Professor Scott added: “We envision these batteries to be used in situations where it is not feasible to charge or replace conventional batteries. Obvious applications would be in low-power electrical devices where long life of the energy source is needed, such as pacemakers, satellites, high-altitude drones or even spacecraft.
I really want a nuclear-powered stuff that I don't have to recharge constantly sometime in this century. Wristwatches, laptops, cell phones… there are just too many things to list.