Acer Battery Hack

Ok so I sold my acer netbook i had and the battery stopped working a few days ago and wouldn't charge or turn on the laptop, unless i ran it from the power cord.

So I sold it w/o the battery and took the battery apart...

Now I want to see if this battery works at all and if it can be fixed or modded

its a 6 cell 4400mAh

Please forgive me my electrical knowledge is limited

This is what it looks like with the casing off...



and I see 5 wires connected on the main board black, blue, yellow, black, red

on the board there are a few connections where the wires go to red= 12V Yellow= 8V Blue= 4V Black= 0V



I have a very cheap multi meter but when i switched my meter to the "read" spot [ it says 1.5V (4.0 mA) and 9V (25mA)
So it seems that it reads mA levels? (I think thats miliamp?)

I got 16.7 from the red and black wires on the battery and if that's reading mA then thats really low because the total power of the battery is 4400mAh



So I then tried to see if I could get any reading from the back of connector touching the outer most spots and i got nothing, I keep trying till i reached the middle and nothing, so was that just dumb or is it broke?....



I saw a guy rig up a laptop battery for an msi wind that can power an iphone from usb Here: http://prusadjs.cz/2009/07/usb-iphone-charger-from-msi-wind-battery/

and it would be really nice to do that but i dont know why this battery stopped working in the laptop?

it shows it has some power in it so thats good right?...but is there any way I can charge it and use it again or power anything?

 

You can buy a Li-ion battery charger and those really bright 200lumins+ flashlight for under $25. You can go out and blind people with it or put it under your rifle and serve it as tactile flashlight.

Or you can get a 200mW+ laserpointer which uses 18650 batteries. Then you can hide in the bush, and burn a hole through people's cloth or do something mischievious. :mrgreen:

 

Please be careful! Handling a Li-ION incorrectly can lead to explosion and fire!

 

yes I am aware enough to be careful but I need to know if there is any way I can try to reuse this and/or fix it? I cant see anything burned or not connected

 

Dispose it properly and find something else. Be happy not to have selected the amperemeter on your multimeter else those cells would have been shorted out and already exploded. Believe me, it's not worth it.

 

These cells are plain old regular 18650 li-ion cells. Use them like any batteries on devices which uses 18650 batteries.

 

@jackluo923

This says enough about the poster's knowledge in electronics, doesn't it?

 

well ya I dont know alot about electronics but I already mentioned that, but how was that statement you quoted from me wrong?

 

http://en.wikipedia.org/wiki/Battery_(electricity)#Battery_capacity_and_discharging

 

How amazing would that be? :twisted:

 

Although that comment wasn't particularly politely worded, I think it was meant as a warning.

Firstly, you aren't using your multimeter properly. The setting in your photograph is meant for checking individual batteries not for measuring voltage or current.

The 16.7 that you refer to is the voltage (measured in Volts) not the current (measured in Amps or mA). Mali's comment above should not be ignored. When you measure voltage, the multimeter has a very high resistance so as not to affect the voltage being measured. It is generally safe to do this. However, to measure current, the multimeter will have a very low resistance, again so as not to affect the current being measured. Measuring the current would effectively have shorted the battery which could result in a face full of bits of battery.

If you don't understand this you really should stop playing around with this and do some more research before something unpleasant happens.

I really don't mean to be rude, but since you don't appreciate the implications of what you are doing, you should take care - these batteries can be dangerous.

 

I'm guessing that 1 or more of the individual batteries in the battery pack failed. You can use your multimeter to determine which one(s) are bad. To do this, measure the voltage across each battery individually. (Put the red lead to the positive end of the battery and the black lead to the negative end. The meter should read about 1.5 volts, if less than one volt, the battery is bad. Repeat this for each battery. If there isn't enough room to get the lead in between the batteries, use a dime or a little piece of tin foil, a paper clip, etc.) If one or more are bad, then the battery pack is useless, but the batteries that test OK are usable for anything you want - flashlight, toys, laser, etc. - simply cut them apart (It is very difficult for the novice to desolder the connections between the batteries without overheating the batteries and destroying them [the batteries are actually welded together.]. You can charge them with a battery charger for AA rechargeable batteries. A Li-ion charger should be used, but you may have trouble finding one. A Ni-CAD charger will work but don't leave the batteries in for more than a few hours.

Good luck,
Dave

 

What a load of bullshit!!!

Li-ION !!

Yep, it's difficult to desolder something that has been welded in the first place :roll:

What??!!

Haha.

Someone delete this thread please, it makes me sick!