As far as developing a battery that (practically) doesn't wear out goes, a better candidate for research might be the Oxford Bell, which has been verifiably working more or less continuously not for just ten years.... but for almost 175 years!
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2F5%2F54%2FOxford_Electric_Bell.jpg%2F170px-Oxford_Electric_Bell.jpg&hash=64bf43d16a29fc87ed56920f2cd7b03c)
http://en.wikipedia.org/wiki/Oxford_Electric_Bell