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Making a battery to charge my laptop on the road

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CnTrL.

May 1, 2018
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Crossed posts.

Why not simply get a second battery for your laptop and carry a charged one around with you? This contains (1) the batteries (2) the protection (3) the regulation (potentially) and (4) comes with its own case.
I would love to get a second battery for my laptop, but the problem is you can't just pop it out of my laptop and back in. I would have to unscrew about 15 screws and take off the complete backside of my laptop.
 

CnTrL.

May 1, 2018
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You need a complicated lithium battery charger circuit that is designed and wired so that all your lithium cells are balance-charged. Your laptop has the complicated charger circuit inside it and the laptop "charger" is simply a power supply for it.

Your simple idea will probably cause a lithium explosion followed by a VERY HOT fire.
Would it be possible though to change the current 18650 cells in my laptop so that it just has a larger capacity, currently there are the Samsung ICR18650-22F in there, these are 2200mAh and 3.6 v and 4.4 A. Could I replace those with the Samsung INR18650-35E, these have a larger capacity of 3400mAh and 10 A, these are also 3.6 V. This way I can leave the current circuitry that's already there but have a 1.5 times bigger battery?
I hope this doesn't blow up :)
 

BobK

Jan 5, 2010
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Apple, Samsung and Boeing are just a few of the companies that have built Lithium Ion chargers that cause the batteries to explode.

And you, who admits he doesn't know how current works, want to build one?

If you build your own battery pack and take it on a plane with you, please inform me of any flight you will be on.

Bob
 

CnTrL.

May 1, 2018
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Apple, Samsung and Boeing are just a few of the companies that have built Lithium Ion chargers that cause the batteries to explode.

And you, who admits he doesn't know how current works, want to build one?

If you build your own battery pack and take it on a plane with you, please inform me of any flight you will be on.

Bob
Fortunate for you I don't take many planes ;)
Plus, I will make sure everything is done correct before I even start!
 

CnTrL.

May 1, 2018
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but if you're doggedly determined to build your own then there are many instructables on the subject such as:

http://www.instructables.com/id/DIY-Professional-18650-Battery-Pack/
I looked at this instructable and I made a new scheme according to this and with a little help from some other websites :)

List of parts I want to use:
- Panasonic NCR18650B -> https://www.gearbest.com/batteries/pp_383600.html?lkid=12173258
- BMS board 5S 100A -> https://www.banggood.com/3_7V-100A-...-p-1245836.html?rmmds=search&cur_warehouse=CN
(please check if this one's good for my project, not so sure if they mean 3.7V per battery or in total)
- Battery indicator -> https://www.banggood.com/2S-3S-4S-5...-p-1095698.html?rmmds=search&cur_warehouse=CN
- 4x5 18650 spacer -> https://www.banggood.com/4x5-18650-...-p-1122766.html?rmmds=search&cur_warehouse=CN
- Rocker switch -> https://www.banggood.com/10pcs-Rock...-p-1276758.html?rmmds=search&cur_warehouse=CN
- DC plug -> https://www.banggood.com/12V-DC-Pow...-p-1118094.html?rmmds=search&cur_warehouse=CN
- Different colours LED Diodes -> https://www.banggood.com/200pcs-5MM...-p-1009873.html?rmmds=search&cur_warehouse=CN

Is it correct that the DC jack is both used for charging the batteries and for charging the laptop?
 

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Audioguru

Sep 24, 2016
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Many Instructables are made by little kids who are only 10 years old.
The Banggood BMS limits the current way too high at 100A! Also it lets the battery voltage get much too low.
Each battery cell is 4.20V when fully charged. Then five in series will feed 21.0V to your laptop. Is that OK?
The instructions for the BMS do not say how much voltage to feed it.


Do you really want to get the Cheeeepest junk that you can find to charge dangerous Li-Ion cells??
 

Michael Elder

May 2, 2018
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Easiest way to balance charge them would be to use battery holders so you can take them our separately and charge them elsewhere. You could use a buck converter to change what your cell configuration is, since the input and output voltages are adjustable, and tune in your output voltage, which you could then change if you ever wanted to charge a different laptop. As for how to charge them, burying several TP4056 lithium ion charging circuits makes it a lot easier. If you want to power multiple on one USB adapter, just solder the power terminals for them in parallel on the charge circuits.
 

CnTrL.

May 1, 2018
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Do you really want to get the Cheeeepest junk that you can find to charge dangerous Li-Ion cells??
Well not necessarily of course, but he linked to banggood so I thought there will probably be 5 series boards as well, and this was the better looking one of the 2 options to be honest...
Could you link me a good starters board, for 5S and about 15-30 A?
 

CnTrL.

May 1, 2018
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Easiest way to balance charge them would be to use battery holders so you can take them our separately and charge them elsewhere. You could use a buck converter to change what your cell configuration is, since the input and output voltages are adjustable, and tune in your output voltage, which you could then change if you ever wanted to charge a different laptop. As for how to charge them, burying several TP4056 lithium ion charging circuits makes it a lot easier. If you want to power multiple on one USB adapter, just solder the power terminals for them in parallel on the charge circuits.
Do you mean the phone chargers like these: https://www.banggood.com/LCD-Screen...l-left-viewhistory__4&ID=224&cur_warehouse=CN
That I rewire a couple of USB cables to create 20 volts?
 

davenn

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Sep 5, 2009
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@CnTrL.

I'm really worried that you don't seem to have the knowledge, understanding or experience for a project like this

To protect yourself, others and ourselves, I am closing this thread due to it being dangerous without experience


Dave
 
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