Laptop Battery

[manyak52]

Hi i'm new member from turkey. my problem is not about lights but i think the best forum is here for this question.

I have an acer aspire 5710g laptop and its battery is dead now. i bought a battery 4 months ago from ebay. it was 6 cell 14.8v 4800mAh. Its capacity was ~65000mWh but now when battery is fully charged it gives ~3000mWh. Original one is same ~3000mWh.

i learned that i can change the cells in batteries yesterday so i disassembled the battery that i bought from ebay. they used INR18650A220 cells and i measured the output voltage cell by cell. they give 3.9v. during measuring suddenly smoke began to dismount. i'm so lucky that the explosion did not happen.:eek: I taped the battery than pluged into laptop. in the everest software it shown ~670000mWh. and %0 charged :)

first question if i go on charging will battery stop charging at 65000mWh or will it force 670000mWh?

anyway i have one battery remaining :) if my ebay battery doesn't work at all i want to change the cells in it.

i opened original battery has 6 cells. 11.1v 4000mAh used Sony US18650GR


i found this battery from ebay
http://cgi.ebay.com/6-pcs-Ultra-fir...emQQptZLH_DefaultDomain_0?hash=item1e5aa3dd49
would i trust these cells?
where can i buy this sony cells with low shipping cost?
or which cell would you recommend to buy?

i'm living in turkey please calculate shipping value:)

final question :)
can i do this proccess at home? :thinking:
smoke was my fault i make short circuit.
if i solder the wires safely is there a explotion risk?

sorry for my poor english. working on it :)
thanks in advance
best regards

 

[jasonck08]

Hello, I would not trust those Ultra-Fire batteries from eBay. They are poor quality and probably have poor capacity and cycle life.

I would only trust some of the worlds largest battery makers: Sanyo, Panasonic, Samsung, LG, Sony etc.

These cells are not cheap, especially if you purchase in low volume.

Also, when assembling a pack it is usually important to match cells with similar capacity. For example, test 15 cells and pick the 6 that are of similar capacity.

Rebuilding a pack can be done at home, but I wouldn't recommend it because it is dangerous, especially if you wire something wrong and short circuit etc.

Also manufactured packs use a special battery welder to the cell doesn't heat up. If you just use normal soldering methods the battery will heat up a lot. There is a special attachment I believe called a hammer head bit for a soldering iron, that can help you more efficiently solder batteries.

 

[manyak52]

thanks for your answer. yes i know that method. in turkey we say "puntalama" searched from dictionary it says "machining" is this what you told me?
and do you know where can i buy these cells?

 

[mcnair55]

I second jasonck08 advice,not a job for you to be doing.My laptop is worth more to me running with a pro built battery not the kitchen table type.