Beginners Guide to Processing 18650 Cells | Cell Database


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Laptop Powered... Laptop !?
#1
I saw a guy string together some 18650s in series and plug them into the power brick port on a laptop. Supposedly it works. I wonder though:  If I have say, a 19V laptop and attach a 5s battery to its external power port, will it tolerate the variation of voltage in the battery? 21V - 15V? 

Seems like some kind of regulator should need to be added to this thing if it were to function safely. What would such a device be called? When I search for Voltage regulators, I get car and motorcycle regulators, or buck converters. What I'm thinking of would be a device that would take a range of Voltage in, and send a steady 19V out.

I think it would be a fun project to build a sort of lap-desk with a cooling fan, USB hub, and a built-in 18650 external battery. With a cup holder. Smile
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-Mike G
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#2
Yes. DC is always DC, whether is from adaptor or battery... as long as the voltage/Current & plug stay the same it can work. To add batteries thru the DC connector in will be much nicer.. most laptop will have internal regulation thru the DC in. This way, you can add as many battery as you want to lengthen the operating time. Probably put this power pack in your bag and just pull a DC cable to your laptop and you're good to go...
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#3
There's a guy who did this on Overclock.net, using recycled 18650s a balance charger and a boost converger to get stable 20v output. He is the inspiration for my project.

Search DIY Laptop Battery Overclock.net, since I can't link on mobile for some reason. The guy doing this is pretty smart.

Also, for your question, it Is called a boost converter. Boosts voltage to a constant set level.  Bought 5 on Ebay , 3x75W, and 2x150W. In your case though, I would advise you to go with a 4S battery instead, since it would be much easier to regulate and produce 20V out of the boost converter.
It's better to over engineer something than to cheap out.
As I say: You pay once, you cry once.
                                 You pay multiple times, you are a doofus
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#4
Somehow I don't think you would be able to take a custom built 18650 pack on a plane, where you probably need the extra power most.
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#5
As long as it's below 100Wh, no probs. Get between 110-160Wh though, this is starting to be problematic, especially for a DIY 18650 pack as mike said. Wouldn't take the risk at all anyway though.
It's better to over engineer something than to cheap out.
As I say: You pay once, you cry once.
                                 You pay multiple times, you are a doofus
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#6
I'd personally go with a buck converter and make the series slightly higher than what I need. Then it could easily provide the current required by the device.
Proceed with caution. Knowledge is Power! Literally! Cool 
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Certified 18650 Cell Reclamation Technician
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#7
(09-07-2017, 09:28 PM)BlueSwordM Wrote: As long as it's below 100Wh, no probs. Get between 110-160Wh though, this is starting to be problematic, especially for a DIY 18650 pack as mike said. Wouldn't take the risk at all.

Anything that looks DIY of 18650s is going to look like a bomb to TSA and they'll be escorting you aside pretty quickly. I wouldn't even think of trying it regardless of how many watt-hours it is...
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#8
(09-07-2017, 11:32 PM)mike Wrote:
(09-07-2017, 09:28 PM)BlueSwordM Wrote: As long as it's below 100Wh, no probs. Get between 110-160Wh though, this is starting to be problematic, especially for a DIY 18650 pack as mike said. Wouldn't take the risk at all.

Anything that looks DIY of 18650s is going to look like a bomb to TSA and they'll be escorting you aside pretty quickly. I wouldn't even think of trying it regardless of how many watt-hours it is...

If you put heat shrink on it with hobby discharge and balance connectors on it, it'd look a lot like a drone pack (which competitive racers carry on frequently).  I wouldn't bother with it personally though. It will probably call delays at security and you might still be asked to leave it behind.
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#9
Well, I don't use airplanes, so no problems there, LOL.

I did see this device, though this is the only website that seems to have one.
http://www.batteryspace.com/dc-dcregulat...mpmax.aspx
Anyone buy from this site before?

Also, when calculating Watt-Hours, do you use the full or nominal cell voltage?
-Mike G
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#10
1. Batteryspace is a reputable site. Don't worry.
2. Always use nominal cell voltage.
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It's better to over engineer something than to cheap out.
As I say: You pay once, you cry once.
                                 You pay multiple times, you are a doofus
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