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[mister x]

....
1     What is the consensus on charging ones DS overnight with the SC and SD card still inside??

11    I see in the DS manual that on average it takes 4 hours to charge....
is it a problem if the charging takes place thru-out the night(ie 8 hours at least?)??
Thanks

[kof91]

I leave my nds to charge overnight. I think the charging will stop once the battery is full coz when I wake up the charging light was already off.

[Koji]

This hasn't been a problem with electronics in a long long long long long longl ong long time. Way back in the day, rechargable batteries would explode if they had been left charging for extended periods of time... but a long time ago they developed hardware for batteries to prevent that to happen.

Why people still worry about this sort of thing to this day, I have no clue.

[mister x]

"Why people still worry about this sort of thing to this day, I have no clue."

i think you misunderstood.....i'm not worried...i just dont know the answer, hence the question...thankyou for your time to answer, but really koji, why add the condescending tone as well....??

[karurosu]

The psp battery is a li-ion, so the usual precautions are:

-Charge it to full before first use.
-Never overcharge them (that with NDS I think it stops charging when done)
-Never let it drop below 20% of charge, it KILLS the battery.
-Always charge them when at 60% or more.
-Never discharge them (That I said on point 3, but I want to say it again for people that didn't get it)
-If you are not going to use them for long periods, store them with at least 60% of charge (too low can kill the battery, too much shortens it's life), (make sure the temperature is warm, too cold or too hot also affects them)
-Never buy extra batteries (if your battery dies, buy a new one, but don't buy extras)
-Always check the expiration date. (that's why you should not buy extras)

If you follow those tips, you battery can last longer.

[mister x]

thanx karurosu...a top notch answer from someone who cares to share his knowledge, with NO strings attached...

[cory1492]

Im not sure what happened, but somewhere along the line my DS's battery life got shortened (I can get only about 4hours with it now, official DS games or GBA flashcarts)

karurosu, do you know of any way to "reset" or re-extend a shortened Li batteries life (I know there is a way, but the translation of chinese was not very clear); I personally think the protection circuit is doing something funky like turning the DS off before its actually discharged to a more reasonable level, but I have not gotten out to get a new battery to verify this (perhaps the battery has reached its life expectancy / expiry at 1 year old?)

[karurosu]

Browsing I found this:

Lithium-based batteries have a defined age limit. Once the anticipated cycles have been delivered, no method exists to improve the battery. The main reason for failure is high internal resistance caused by oxidation. Operating the battery at elevated temperatures will momentarily reduce this condition. When the temperature normalizes, the condition of high internal resistance returns.

The speed of oxidation depends on the storage temperature and the battery’s charge state. Keeping the battery in a cool place can prolong its life. The Li-ion battery should be stored at 40 percent rather than full-charge state.

An increasing number of modern batteries fall prey to the cut-off problem induced by a deep discharge. This is especially evident on Li-ion batteries for mobile phones. If discharged below 2.5V/cell, the internal protection circuit often opens. Many chargers cannot apply a recharge and the battery appears to be dead.

It seems I got the number of the charge wrong, it's 40% when storing the battery.

Complete info:
http://www.buchmann.ca/Chap10-page7.asp

Here is a page with guidelines for LI-ion:
http://www.buchmann.ca/article23-page1.asp