at 40% charge

and it really does make a huge difference

try it out

2/3/2007 11:51:51 PM

suspend this troll

2/4/2007 12:27:22 AM

this is a serious thread

look it up

2/4/2007 12:32:13 AM

you shouldn't do that duke did it first

2/4/2007 12:54:24 AM

didn't they already de-bunk this on Mythbusters a while ago?

2/4/2007 10:08:44 AM

^^ haha

2/4/2007 2:38:53 PM

he's right. this is well known.

the worst thing for lithium-ion laptop batteries is heat. fully charged batteries in the laptop keep an internal temperature of about 140 deg F. in that condition, typical laptop battery will last about 12-18 months.

just removing the battery from the laptop when not in use (ie, when running on main power) will dramatically increase battery life.

the ideal storage is in a cool place at 40% charge. but that's not always practical. if you need to store it long term, then sure, do that.

but just pulling it out of the laptop when not using battery power, so that its not constantly charging at 140 degrees, that's the big issue and that's where you'll get the biggest conservation of battery capacity.

2/5/2007 4:10:52 AM

Quote :

"fully charged batteries in the laptop keep an internal temperature of about 140 deg F"

Pretty sure you mean the inside near the processor, the batts are enclosed by themselves with no heat source, if they're barely being kept fully charged while you're running straight from the outlet,they're not going to be putting out much heat at all. Now if you got your laptop on shag carpet blocking all the fan exhausts then maybe, but you'd have more problems than a dead batt at that point.
If Li-ions stayed at that temp for long periods they'd most likely rupture and be useless within weeks or days. Think about it, a water heater is usually on the higher end near 120F, that would scald the shit outta me, tack on another 20F and those batts wouldnt last a day. They form gas pockets from the internal chemistry, bloat, and explode/catch fire like those Sony laptops.
Took mine out and its about 85F on both sides.

2/5/2007 5:45:49 AM

I wonder how all the condensation that will form on the battery after you pull it out of the freezer will effect battery life?

2/5/2007 12:10:18 PM

not the freezer

the refrigerator

2/5/2007 12:15:54 PM

Oh, my bad.

I wonder how all the condensation that will form on the battery after you pull it out of the refrigerator will effect battery life?

2/5/2007 12:20:49 PM

make a huge difference in what?

1) the length of time you can run your laptop off the battery in one sitting?

2) the number of months/years your battery works (continues to provide a charge)


you people need to be clearer in whatever bs crap youre asserting.

2/5/2007 12:23:56 PM

^^lol

[Edited on February 5, 2007 at 12:24 PM. Reason : .]

2/5/2007 12:24:12 PM

Yeah, I'm not believing the battery sits at 140F either. Especially when mine warns to not exceed that temperature.

2/5/2007 12:35:06 PM

i've always wondered how all this worked...ever since i can remember, my parents have kept their batteries in the fridge or freezer

that said, ever since i bought my first laptop 6 years ago, i've always pulled out my full batteries...just seems to me that keeping it constantly charged would be bad for it

*shrug*

2/5/2007 5:14:01 PM

when i said battery temperature, i meant internal battery temperature, not necessarily what you feel on the outer casing.

but... i also got the number wrong. the internal temperature of a fully charged battery sitting in a powered-up laptop is about 115 F (45 C).

sorry, my C->F conversion sucks.

anyhow the point was that it's the constant excessive internal heat that fries the battery. just the act of pulling it out when not using battery is a world of difference.

yeah, doing the 40% charge in the refrigerator thing is better, but it's not necessary unless you really are going to be storing the battery for long periods of time.







[Edited on February 5, 2007 at 9:37 PM. Reason : ]

2/5/2007 9:33:02 PM

That's one way to keep them from exploding.

2/6/2007 1:07:48 PM