The Tungsten T5 however, included a much newer battery and is therefore a much less likely candidate for replacement, at least not yet. Much fuss has been made over the issue of the iPod's built-in li-ion battery and the fact that it is not designed to be replaceable. Some have similar concerns over their handhelds' batteries and decide to try and remedy the problem themselves, just as was done on the iPod before Apple started offering extended warranties: in fact, Apple iPod replacement batteries have become somewhat of a favourite for use as external replacements/additions.