SINGAPORE (Reuters) - Lithium-based batteries have been powering our portable devices for 25 years.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=f5fLDajGIHM:aASK_Kf1HvE:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=f5fLDajGIHM:aASK_Kf1HvE:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=f5fLDajGIHM:aASK_Kf1HvE:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=f5fLDajGIHM:aASK_Kf1HvE:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=f5fLDajGIHM:aASK_Kf1HvE:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/f5fLDajGIHM" height="1" width="1" alt="" />