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18650 battery pack
18650 battery pack
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Old 15th April 2016, 07:21 AM   #1
Camerong is offline Camerong  New Zealand
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Join Date: Nov 2015
Default 18650 battery pack

Hey everyone.
What do you guys think of building your own 18650 battery packs? Or is it better to just buy one with included bms and charger to suit..

I was thinking something like this

22.2V 25.2V 6*18650 2600mAh 6S Lithium ion Li-ion Battery Pack [6x 18650 6S 22V 2600mAh] - $38.20 : Lithium Rechargeable Batteries, Battery BMS, Pack Assembling

Li-ion Li-Po 25.2V 22.2V 2A 6S Wall Socket Battery Charger AC DC [25.2V 2A Lithium Battery Charger] - $17.20 : Lithium Rechargeable Batteries, Battery BMS, Pack Assembling

But it seems a lot cheaper to rip a laptop battery apart and wire 6 batteries in series and put a bms on it. Or is it not as simple as that?

I want to have a switch switching from the battery pack to 240 ac.

Can someone please send me an idea
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Old 16th April 2016, 12:58 AM   #2
Foxx510 is offline Foxx510  Australia
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Join Date: Nov 2006
I don't see a problem with using laptop cells if that is cheaper. You do need to know what you are doing though with these - they don't respond well if mistreated as you are probably aware. Just don't try to solder to them - only use tabs or spot welding. Which bms are you considering? What is the load?
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Old 16th April 2016, 01:14 AM   #3
Camerong is offline Camerong  New Zealand
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Join Date: Nov 2015
Haven't decided in a bms yet can you recommend one?
Here's the load
Sure Electronics AA-AB32174 2x50W TDA7492 Class-D Amplifier Board

Or

http://home.teletu.it/APPSI/APP%20SI...0DATASHEET.pdf
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Old 16th April 2016, 03:10 AM   #4
Bare is offline Bare  Canada
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Join Date: Dec 2001
Location: vancouver
IF you want Battery power ??
Either Use Lead Acid cells (moto batteries are smallish/inexpensive)
OR Nicad cells which have tested as being Extremely 'clean' (best) battery power sources.
Bit of a chase to find these days.. but still doable.
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Old 16th April 2016, 05:13 AM   #5
Foxx510 is offline Foxx510  Australia
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Join Date: Nov 2006
Something like this? 22 2V PCM Protection Circuit Module for 6S Li ion Li Po Battery CURRENT10A SM519 | eBay
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Old 16th April 2016, 10:09 AM   #6
Camerong is offline Camerong  New Zealand
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Join Date: Nov 2015
Yeah I was thinking nicad but it's heavy and has memory loss after a while. It's going to be a portable speaker box and I would prefer it to be as light as possible.
Even if it cost me a bit more.

Just wondering how I could have one cord and be able to charge the battery and run it off the same cord for 240v ac.
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Old 16th April 2016, 11:14 AM   #7
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
I just bought a 22Ahr 3.7V battery pack. It weighs 462g
It has it's own built in charging system, so hopefully the USB 5V never damages it.
It also has a set of USB 5V outputs.
Use that into a DC to DC converter and you are go.

Building you own lithium battery charger is not easy.
__________________
regards Andrew T.
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Old 16th April 2016, 11:46 AM   #8
Foxx510 is offline Foxx510  Australia
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Join Date: Nov 2006
Quote:
Originally Posted by Camerong View Post

Just wondering how I could have one cord and be able to charge the battery and run it off the same cord for 240v ac.
You'd need to limit the charge current to the cells(and the voltage, obviously) if you used the same plugpack to charge the cells and run the device. You don't want to be charging your cells at 5 amps or whatever the plugpack you use is. 1 amp would be about right.

Charging single lithiums is simple CC/CV charging. The trick managing your cell balance, over discharge etc. You need a decent bms for that.
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Old 16th April 2016, 09:55 PM   #9
Camerong is offline Camerong  New Zealand
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Join Date: Nov 2015
Ah ok right.
So I will would be much better off having two separate
Plugs one for running the device and one for charging.
I'm not too worried about that.
Just would have been convenient.

Also is the bms the only circuit that I will need on the safety side on charging?
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Old 16th April 2016, 09:58 PM   #10
Camerong is offline Camerong  New Zealand
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Join Date: Nov 2015
Quote:
Originally Posted by AndrewT View Post
I just bought a 22Ahr 3.7V battery pack. It weighs 462g
It has it's own built in charging system
Where did you purchase this Andrew?
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