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Old 09-09-2012, 04:15 PM #1
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Default 18650 charging circuit

Hi,

I'm in need of a simple circuit to charge and stop charging a 18650 in a piece of equipment I'm building.

Need to be able to power it from a typical cheap wall adapter and then cut off when its fully charged, the 18650 is non removable from the equipment you see.

Anyone seen any little circuits on any of the Chinese sites or Fleabay?


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Old 09-09-2012, 04:32 PM #2
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Default Re: 18650 charging circuit

I don't know if you need it but I have some wall adapter left over from the Police lasers build. They are suppose to charge a single 18650 cell in the host. The chargers are not used for the laser. They are 4.2V DC from 110-230VAC.
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Last edited by Blord; 09-09-2012 at 04:39 PM.
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Old 09-09-2012, 04:33 PM #3
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Default Re: 18650 charging circuit

You can get little IC's that'll handle all the charging for you. Sparkfun have a few little charger PCB's (I believe LiPo and LiIon are both charged using the same process): https://www.sparkfun.com/search/resu...&what=products

But you can probably find something cheaper elsewhere.
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Old 09-09-2012, 05:07 PM #4
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Default Re: 18650 charging circuit

I use this guy in my LPM:
MCP73831T-2ACI/OT Microchip Technology | Mouser
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Old 09-09-2012, 05:19 PM #5
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Default Re: 18650 charging circuit

@ Blord

do you have more details and/or photos? does it connect to the battery directly with no circuitry needed?

@ Things

Thanks , not cheap though haha , this would be ideal

https://www.sparkfun.com/products/10401

@Justin

Any photo's or circuit diagram?
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Last edited by ped; 09-09-2012 at 06:21 PM.
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Old 09-09-2012, 07:12 PM #6
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Default Re: 18650 charging circuit

You can omit the 470 resistor and led if you dont want a status indicator

Chip will do 500mA max
2k resistor sets the current at 500mA
Charge current = 1000V / RPROG

You also wont need cap across vbat, since your battery will allways be connected


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Last edited by justinjja; 09-09-2012 at 07:14 PM.
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Old 09-09-2012, 08:16 PM #7
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Default Re: 18650 charging circuit

That looks pretty good thanks.
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Old 09-09-2012, 08:42 PM #8
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Default Re: 18650 charging circuit

http://laserpointerforums.com/f67/18...ml#post1110916

Here Ped.
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Old 09-09-2012, 09:07 PM #9
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Default Re: 18650 charging circuit

That looks spot on, cheers
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Old 09-09-2012, 09:37 PM #10
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Default Re: 18650 charging circuit

Quote:
Originally Posted by ped View Post
@ Blord

do you have more details and/or photos? does it connect to the battery directly with no circuitry needed?
It is just a power supply. I didn't removed the parts in the flashlight.

http://users.telenet.be/nihao/Home/IMG_4707.JPG

It came from here,
KK-001 1-LED 220LM 1-Mode White Flashlight - Black (1 x 18650) - Worldwide Free Shipping - DX

Let me know if you want it.
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Old 11-09-2012, 03:34 AM #11
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Default Re: 18650 charging circuit

This will help you

Mini USB Lithium Battery Charging Board Charger Module 5V 1A Good | eBay
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