Electronics > Beginners
Rebuilding laptop battery pack
eletronob:
Hello to everyone,
Can anyone please help me in this task?
I want to replace the batteries from my laptop's battery pack.
The battery pack specification: 10.8V, 4.40Ah.
Inside there are 6x 18650 batteries Samsung ICR18650-22F, 2200mAh, 3.6V.
I searched long time on eBay and the cheapest I found are around AUD 45-50 for 6 batteries which makes no sense because I could buy a battery pack already assembled with bigger capacity for around AUD 60.
Then I found batteries which are used for vape torches that are much cheaper and have a bigger capacity, I had to enter a specific description to find these in the hopeless eBay's search engine that they will never fix.
The batteries have a Sony code VTC6 and have 3000mAh capacity.
This is a sample: https://www.ebay.com/itm/Genuine-US18650VTC6-18650-Battery-3000mAh-High-Drain-30A-For-Vape-Torch-4Pcs-57/333132741593?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3D111c57615e4546c887aa168838f3f787%26pid%3D100005%26rk%3D5%26rkt%3D12%26sd%3D253918563616%26itm%3D333132741593&_trksid=p2047675.c100005.m1851
My question is can I replace the original 2200mAh batteries with these of 3000mAh?
The original battery pack includes a mini board.
Thanks in advance.
xavier60:
I have done the same thing. It can be an unforgiving and potentially dangerous job that has to be done right the first time.
I will not explain in detail as to how I made the connections. I will say that those paper washers stuck to the + end of the cells are important for preventing connecting conductors from puncturing the cell's plastic covering and causing a nasty short circuit.
The various types of protector PCBs can behave in different ways. Some will never work again after the original cells are completely discharged or disconnected. Others will happily work again, sometimes needing a brief charge to wake them up.
I have some gutted Toshiba battery shells here that I can connect an external 12V battery to and with a 3 resistor divider to supply the cell voltage sense wires, use to power a laptop. They will even report a useful state of charge.
You should assess the protector PCB.
Using higher capacity replacement cells is not a problem.
eletronob:
--- Quote from: xavier60 on March 27, 2019, 10:20:24 am ---You should assess the protector PCB.
--- End quote ---
Thanks for support.
What do you mean for assessing the PCB?
mariush:
The "high drain" batteries used for vaping may not work well with a laptop that's slowly discharging the batteries over long period of time.
Think about it ... you have a laptop averaging 20-30 watts from battery pack, so around 1-2A discharge from batteries, and you use batteries "optimized" for high discharges of up to 30A, for brief periods of time (suck on the cigar for a few seconds, then idle for much longer, giving battery time to recover)
The vape battery may also have issues charging at the higher currents.
Digikey stocks some 18650, for example some asian stuff rebranded by Sparkfun :
6$ each (no solder tab) : https://www.digikey.com/product-detail/en/sparkfun-electronics/PRT-12895/1568-1488-ND/5271298
6.5$ each (with solder tab) : https://www.digikey.com/product-detail/en/sparkfun-electronics/PRT-13189/1568-1490-ND/5271299
The ones with solder tab would be more suitable as it would make soldering them together much easier.
eletronob:
--- Quote from: mariush on March 27, 2019, 10:39:44 am ---The "high drain" batteries used for vaping may not work well with a laptop that's slowly discharging the batteries over long period of time.
Digikey stocks some 18650, for example some asian stuff rebranded by Sparkfun
--- End quote ---
Thanks very much for information, I was just wondering what was the meaning of these high discharging batteries.
But also I may not order because they cannot deliver batteries by air!
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