5 . ▁One ▁week ▁later , ▁Apple ▁offered ▁an ▁extended ▁i Pod ▁war rant y ▁for ▁US $ 5 9 . ▁For ▁the ▁i Pod ▁N ano , ▁sol der ing ▁tools ▁are ▁needed ▁because ▁the ▁battery ▁is ▁sol der ed ▁onto ▁the ▁main ▁board . ▁Fif th ▁generation ▁i P ods ▁have ▁their ▁battery ▁attached ▁to ▁the ▁back plate ▁with ▁ad hes ive . ▁ ▁The ▁first ▁generation ▁i Pod ▁N ano ▁may ▁over he at ▁and ▁pose ▁a ▁health ▁and ▁safety ▁risk . ▁A ffect ed ▁i Pod ▁N anos ▁were ▁sold ▁between ▁September ▁ 2 0 0 5 ▁and ▁December ▁ 2 0 0 6 . ▁This ▁is ▁due ▁to ▁a ▁fla wed ▁battery ▁used ▁by ▁Apple ▁from ▁a ▁single ▁battery ▁manufact urer . ▁Apple ▁recommended ▁that ▁own ers ▁of ▁affected ▁i Pod ▁N anos ▁stop ▁using ▁them . ▁Under ▁an ▁Apple ▁product ▁replacement ▁program , ▁affected ▁N anos ▁were ▁replaced ▁with ▁current ▁generation ▁N anos ▁free ▁of ▁charge . ▁ ▁R eli ability ▁and ▁dur ability ▁i P ods ▁have ▁been ▁critic ized ▁for ▁alleg ed ▁short ▁lif es pan ▁and ▁frag ile ▁hard ▁drives . ▁A ▁ 2 0 0 5 ▁survey ▁conducted ▁on ▁the ▁Mac In Touch ▁website ▁found ▁that ▁the ▁i Pod ▁line ▁had ▁an ▁average ▁failure ▁rate ▁of ▁ 1 3 . 7 % ▁( although ▁they ▁note ▁that ▁comments ▁from ▁respond ents ▁indicate ▁that ▁" the ▁true ▁i Pod ▁failure ▁rate ▁may ▁be ▁lower ▁than ▁it ▁appears "). ▁It ▁concluded ▁that ▁some ▁models ▁were