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HomeOff Topics › Replacing laptop battery cells?
01-11-2010 06:58 PM  8 years agoPost 1
MX400 DUDE

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Oklahoma

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I have a dead laptop battery and was wondering if any of you have replaced the cells in them? It will cost me around $80 for a new battery and that seems like a lot to spend on a laptop that's several years old. Thanks for any info.

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01-11-2010 07:01 PM  8 years agoPost 2
honeybeeman

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kenner, LA

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yeah good point, im using my lap top right now, older version, no battery, using ac adaptor. forget the battery unless u go on trips alot. i think i paid 200 bucks for this puter, 3 years ago, still works fine.

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01-11-2010 07:16 PM  8 years agoPost 3
MX400 DUDE

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Oklahoma

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Sometimes I don't have access to power so I need the battery. I'm going to crack the battery case open tonight and find out what type of cells are in there. Depending on the price I'll just buy some new cells and solder them in.

Looks like my stock battery is 14.4v 4300mah. I'm assuming it's got 8 cells.

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01-11-2010 07:29 PM  8 years agoPost 4
beidle99

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West Deptford, NJ

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My wife and I learned the hardway about laptop batteries. Her laptop which is about 5 years old has a dead battery, if you unplug it goes right into shut down. Not worth buying a new battery just going to wait untill spring and get a new one.

Who raised the ground since I took off?

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01-11-2010 07:43 PM  8 years agoPost 5
MX400 DUDE

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Oklahoma

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I still like my laptop or I would buy a new one. Even if I have to replace the battery it's easier to spend $80 than $600.

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01-11-2010 08:24 PM  8 years agoPost 6
midwestpilot

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Crystal Lake, IL

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the constant charging kills the battery
get a new battery... let it charge up then take it out.
I keep my good battery in my brief case and the bad one in the laptop...

In life there is no spacebar!

Rich Erikson AMA 6175

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01-11-2010 08:27 PM  8 years agoPost 7
MX400 DUDE

rrApprentice

Oklahoma

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That's how I killed it. Should have taken the battery out when I had access to a power.

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01-11-2010 08:45 PM  8 years agoPost 8
duff

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Calgary, Alberta, Canada

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Charge the battery to 40% and store it. DO NOT charge it 100%

LIPO and LI ION will store best at 40%.

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01-11-2010 09:41 PM  8 years agoPost 9
honeybeeman

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kenner, LA

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hey got a question about heli motor batteries, after a flight whats the lowest they should go per cell? and what percentage is that? 30? i knew about storage at 40 percent. thanks

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01-11-2010 09:44 PM  8 years agoPost 10
flyboy0413

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Brookfield, CT

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try ebay. I got a generic battery for my dell laptop for $40 when dell wanted around $90.

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01-11-2010 09:53 PM  8 years agoPost 11
playfair

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Rochester, NY

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Rebuilding a Laptop battery
You'll need to know your pack voltage and mah.
For example, my Dell 620 uses a 7200mah 11.1v pack.
The cells are LiIo 18650 type. Configuration is 3S3P, for 9 cells total.
The cheapest price I found per cell is about $6.
So it would cost $54+sh just for PARTS...
I can buy a new aftermarket pack for $55.


The sky is our canvas

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01-11-2010 10:56 PM  8 years agoPost 12
zaw

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Lebanon, NH - USA

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You need to exercise the batteries in laptops or else they will just die!

ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425

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01-12-2010 12:01 AM  8 years agoPost 13
MX400 DUDE

rrApprentice

Oklahoma

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Rebuilding a Laptop battery

You'll need to know your pack voltage and mah.
For example, my Dell 620 uses a 7200mah 11.1v pack.
The cells are LiIo 18650 type. Configuration is 3S3P, for 9 cells total.
The cheapest price I found per cell is about $6.
So it would cost $54+sh just for PARTS...
I can buy a new aftermarket pack for $55.
If the cells cost $6 each it's not worth it. I can get the aftermarket batteries for about $40-$50 as well but I like genuine parts.

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01-12-2010 02:28 AM  8 years agoPost 14
max232

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Pensacola

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I just ordered a new battery for my laptop on ebay last night fot 31.00 with free shipping.i think i might crack open the old one and see about replacing the cells.

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01-12-2010 03:03 AM  8 years agoPost 15
ruddernate

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sulphur,Ok.

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i just slapped a new one in mine tonight from ebay $41 shipped to my door.

fly it like you stole it

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01-12-2010 02:49 PM  8 years agoPost 16
midwestpilot

rrElite Veteran

Crystal Lake, IL

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storing the battery charged to 40%
is good if you want a battery to be at 40% when you need it... I am assuming you are using your battery off and on.. else you don't need one.. yes.. long term storage not at full voltage.. but if you intend to use it... ya might be happier with full capacity...

I like to fly my choppers with 100% charge don't you?

In life there is no spacebar!

Rich Erikson AMA 6175

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01-12-2010 03:45 PM  8 years agoPost 17
ShuRugal

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Killeen, TX

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the constant charging kills the battery
get a new battery... let it charge up then take it out.
I keep my good battery in my brief case and the bad one in the laptop..
common misconception. your laptop does not continuously charge the battery once it reaches full. Lithium batteries go up in smoke and flames real fast if you keep charging them once they get full. You laptop will charge to full, then switch the charger off and run the laptop off the cord.

what 'kills' laptop battery life when leaving them plugged in is the 'smart' discharge-protection circuitry in the pack and in the laptop. The circuitry is supposed to 'learn' where the minimum capacity of the battery is, so your computer knows when to cut off to prevent over-discharge. the problem comes in where if you never run on battery power, the circuitry will eventually 'learn' that 'empty' is in the 90% range. so the battery will still have a near-full charge, but your computer will think it's empty.

If this happens, you can force it to reset by leaving the computer on battery power until it shuts itself off, then turn it back on (you may or may not need to plug it in before turning back on, varies by manufacturer)

AMA 700159

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01-13-2010 08:12 AM  8 years agoPost 18
honeybeeman

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kenner, LA

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hey that makes sense thanks

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01-18-2010 03:19 AM  8 years agoPost 19
MX400 DUDE

rrApprentice

Oklahoma

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I just got around to taking apart my laptop battery and I tested each cell. They are all showing *roughly* 3.6v each.

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01-18-2010 03:27 AM  8 years agoPost 20
ShuRugal

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Killeen, TX

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so its probably a case of battery control circuit has forgotten where dead is. run the laptop on battery until it shuts itself off (dont you shut it down, let it 'die') and see how it reacts.

AMA 700159

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