Braingle: 'Lost MP3 Player' Brain Teaser

Lost MP3 Player

Trivia brain teasers have some element of trivia in them, but they are not just pure trivia questions.

Puzzle ID:	#35892
Fun:	(2.22)
Difficulty:	(2.29)
Category:	Trivia
Submitted By:	EnderofGames
Corrected By:	4demo

Ralph was a very disorganized guy. About three years ago, he lost a nice MP3 player that had a lithium-ion battery. Last night, he found it and put it in its charger. The next morning, he found it was still dead.

It was fully charged when he lost it. It had been charging all night. Nothing had broken the MP3 player. Why wouldn't it work?

Answer

If a lithium-ion battery is left unused for a long period of time, it goes into deep discharge. This can cause a battery that charges in three hours normally to take about fifty hours to charge. If left long enough, deep discharge can cause it to stop working completely. Ralph was unlucky to have this happen to him.
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Comments

EnderofGames Mar 26, 2007	YES!!! I got it in! And it was close to being rejected...
tuckpaw Mar 26, 2007	not bad but you can bring back even a dead lithium ion battery using a pulse charger set higher than the voltage of the battery
Shikamaru Mar 26, 2007	i figured it worked somthing like that, but didnt know what it was called.
EnderofGames Mar 27, 2007	Just a regular dead one, when it dies in deep discharge, it won't come back, whatever you do. Thanks for the comments!
vlerma Mar 27, 2007	Kind of easy if you are aware of this type of battery and fortunately I was.
LeafFan4life Mar 29, 2007	oh no wonder my portable dvd player wasnt working and now i know why thanks!!
squishysqueak Mar 30, 2007	hahaha didnt get that one
lavender Apr 02, 2007	Cool! But I am SOOO not good at trivia. . .
tintiniscool Apr 20, 2007	I got it when it said Lithium-ion. Good, though!
reptile5000 Jun 01, 2007	clever, but easy
MusiK Jan 18, 2010	moral of the story: don't lose your lithium-ion batteries